All managers are exactly the same. Guys like Klopp might talk about how they want to 'do it another way', but as soon as they're handed the resources they will immediately make use of them. They'd be fools to handicap themselves based on prinicipals of developing youth, most managers in the world only care about the next couple of seasons. Most examples of turning to youth are when a club has an injury crisis or if it's an exceptional case, or a club like Monaco where that's their strategy. The biggest sides can't afford to be patient with young players, it's why the likes of Foden need to get out as soon as they can.
These guys are under immense pressure. One poor season and the fans are on their back, christ Guardiola was a fraud after one year of finishing fourth in the league, you're only as good as your last season as far as the media are concerned. The position they're in is one which demands instant results, they don't have the luxury that the likes of Ferguson had of building something slowly up, they're working in a pressure cooker environment in which clubs will sack a manager at the drop of a hat.
Fans are exactly the same, they'll jump on other teams for spending money but will be quick to make as many excuses as possible when their own club does it. Liverpool fans are a great example of this, for years the narrative was other teams were killing the league with big spending, we do it the right way etc, and now it's whack out the net spend figures to justify huge fees spent. Our own fans make similar arguments but truth is they'd all love it if we started spending like City or United, fans want their team to do as well as possible and generally don't really mind how they get there. I don't think any other manager in Pep's situation would be spending less, there was a rebuild job needed at City with a number of their old core ageing (Zabaleta, Kompany, Toure etc) and others just no longer good enough, like Hart. He saw the issues in the team and went out and fixed them, what manager wouldn't in his position?