What Dyche has accomplished with Everton is really as expected. It's not pretty, but we are mostly well organized and robust. Perhaps in the future we can dream of a different type of football, but then we need quality players.
De Zerbi is perhaps the most hyped manager, and by all accounts, he has done a lot of good. But he also learns that it is difficult to achieve success with a style of play if you don't have the players for it. De Zerbi's style is about creating "counterattacks" by inviting pressure high into the pitch, but then you are dependent on having players who are pressure resistant, and players who can exploit the spaces that arise. With a quality player like Mitoma injured, and partly Solly March, this tactic has become ineffective.
Brighton have also struggled, under De Zerbi, against defenses that are balanced. Despite the fact that he largely uses positional play principles, or zone attacks. The problem is that he does not have the same quality players as Manchester City and Arsenal.
Tactics/style of play is about finding weaknesses in the opponents, and emphasizing the players' strengths. As a rule, the best players will always win if you have equal conditions, but by, for example, creating chaotic matches with many duels and second balls with high intensity, players like Kevin De Bruyne, Silva, etc., will not get to use their strengths, and must play to a greater extent on the opponent's strengths.
So Dyche has essentially done what any sensible manager would have done. He has assessed the strengths of the team and assessed that this is the style that will give us the most points over 38 games. Fortunately for us, he has not fallen for today's hipster ideology, and that there is only one right way to play. The right way to play is the style that maximizes the potential of the players.