I think Angel has done well this season and certainly deserves another window and another go next season.
The one thing I'm finding strange about the comments though is this belief that he's playing this way to make sure his style gets imprinted onto the team, and then he might be more adaptaple next season.
I'll be very surprised if that is actually the case. This is the way Angel plays, he is categorical about that. This is a manager that in his 2nd season took Celtic to the Bernabau and played this way. If you aren't going to adapt a Scottish team at Real Madrid I don't think he'll adapt the way Spurs play. I said it when he got appointed it's his biggest strength and his biggest weakness.
This is why Spurs was always going to be his greatest test, because it's 1 thing coaching in Japan, or the best team in Scotland where the level of opposition means you can play that style and not be punished as much, but it's another thing playing that style in the toughest league in the world.
As for his recruitment at Celtic, it's very hard to judge because it's a total different level. His biggest successes were basically raiding the J league because he knew it well, signing Kyogo, Mateta, Hatate, and loaning Carter Vickers and Jota and converting them into permanent deals.