I think the point of the British core is to try to build a team that can gel well, understand and champion the new culture we are trying to build and also be already somewhat used to a physical and energetic system.
It’s no secret that the PL is a physical league and English players are trained to be physical. This will help when we try to introduce a more hard working and fitness focused system.
In terms of the other stuff, it’s just about identity and consistency. Our team is such a mish mash of so many different ideas, styles, cultures, qualities that it just doesn’t come together at all. If we rip it up and start again we want to this time to have some consistency when we actually rebuild.
Have a core of players who share similarities and can gel well and take on a shared style and image of the club and help us build that. In the end it doesn’t even necessarily need to be British really, if we wanted a more technical style maybe we build around Spanish players but obviously as we’re an English club, due to the homegrown rule and also the style we want to adopt I think English players makes sense. Also it seems like Ole has identified specific English players he wants and so that helps, i don’t think we’d do this if the players of the right style and quality weren’t there
That's all good and well on paper but you do realize that the facts strongly disagree with the picture you're painting here. By analyzing the first xi of the three teams that dominated the PL in the last few seasons we get:
City: 2 Brits (Walker/Sterling), 2 Brazilians (Ederson, Fernandinho), 2 French (Laporte, Mendy), 2 Belgians (Kompany, KdB), 1 Argentinian (Aguero), 1 Portuguese (Bernardo) and 1 Spaniard (Silva).
Liverpool: 3 Brits (Alexander-Arnold, Robertson, Henderson), 3 Brazilians (Firmino, Fabinho, Alisson), 2 Dutch (Wijnaldum, Virgil), 1 Egyptian (Salah), 1 Senegalese (Mane) and 1 Cameroonese (Matip).
Chelsea (their successful campaign under Conte): 1 Brit (Cahill), 2 Belgians (Courtouis, Hazard), 3 Brazilians (Willian, Diego Costa, Luiz), 2 Spaniards (Azpi, [Irrelevant point]), 1 Nigerian (Moses), 1 French (Kante), 1 Serbian (Matic).
That's 6/33 British players starting for the three most successful clubs in the PL during the last 3 seasons. That's also 7 different nationalities for City and Chelsea and 6 for Liverpool just in the starting lineup. So, the conclusion seems to be that: a) good coaching assisted by good scouting is more important for team identity and consistency than having players who speak the same language, who are used to the English weather and who know how to drive on the left-hand side. b) You don't need British players in order to build a hard-working side that can press like hell and run up & down the pitch like crazy. If the plan provided by the manager bears fruit, the players follow their instructions and they remain generally happy where they are.
Don't get me wrong, the basic idea of yours has some merit and you also admit that it doesn't necessarily have to be a core of British players. I believe that what happened with Ronaldo has skewed the views of many United fans. Let's not forget that Fergie's last title-winning sides had the likes of Evra, De Gea (Edwin), Vidic, Rafael, Nani, Valencia, Chicharito, RvP and Park in very important roles. These are all players who have spent lots of years at United and they have been integral to Fergie's plans. Alongside the Brits of course.
What we lack is a spine. Managers have come and gone, they brought their own players, signed a few superstars but the most basic issue of our squad hasn't been solved yet. Building a backbone isn't about nationality or age. It's about understanding your needs and weaknesses. Had we got Godin (who's a world-class defender in the box), one of the more aggressive/proactive CBs like Lindelof or Bailly would have been eased into the first team better because the leadership at the back would have been a given instead of a desideratum. In this sense what does keeping the English lad, Jones or Smalling, offer? And it would have been much cheaper than paying an insane price for Maguire.
That's just one example. We sign players who end up being on the periphery of the action because we can't get the very basics right. Pogba doesn't want to leave because Madrid is nicer than Manchester and his French sensitivity desires more sunshine. If that was the case, he wouldn't have come in the first place. He wants to leave because while the template of how to get the best out of him was there to replicate (Juventus, France NT), we ended up asking of him to do everything on the pitch: Recieve the ball on the edge of our box and be a deep-lying play-maker, then find the spaces in the attacking half and play as a #10 while we moan about his lack of runs in the box too. If you, or anyone else, believe that by signing Rice and Longstaff these problems will go away, i'm sorry to say it but you're in for a surprise. And it won't be a nice one.