Champions League is so overrated. Yes, it is great to get a few extra matches. Yes, it is great to be able to test yourself against top European opposition. But for half the teams, you get 2 or 3 big matches. That's it.
If you play Premier League, you'll get to play Manchester United twice, Manchester City twice, Arsenal twice, Spurs twice, Chelsea twice and Liverpool twice. That is a much stronger pull than to get to play Nice, Porto and Union Berlin.
What made Atalanta an easy choice for El Bilal Toure is that they have a manager that is good with developing young talents while playing offensive and modern football. That's how dreams are made. That's what make it possible to buy a teenager for 17 million euros and sell him to Manchester United for 80 million ten months later.
Compare that with Everton. A team that plays a football that has nothing in common with how successful teams play in 2023. Players that do well for Everton will not be attractive for other clubs, as the style of play and roles are very different. Everton don't do what successful teams do in training. Everton won't develop top players.