Hello SaintsWeb - first time poster, long time observer!
For me, there are two particular issues with Ralph (and the club in general).
The first is that, to a large subsection of the fan base, he is completely above criticism, and they'll contort themselves into oblivion to blame pretty much anything or everything else then be remotely critical of the manager. That's not healthy, and especially not when factors they are blaming - players out of position, team morale, players not motivated to play etc., are his responsibility.
Secondly, he seems to have no back-up plan. Despite Bednarek being exploited heavily at RB against Leeds, Ralph did it again against Everton. As teams start setting up to counteract Ralph's tactics he doesn't make any changes. He's slow to make substitutions. He's slow to mix things up. He seems to favour squad seniority over current performance, or indeed players in natural positions.
Now I'm not saying he should go, I'm not quite sure what the solution is. Changing him might not be the right solution, but a No. 2 that he respects and can challenge him might be.
Yes, as Forester said, 2020 was a great year and he is responsible for that. But there is a third option that Forester doesn't propose. It's entirely possible that it wasn't a blip, and Ralph could have us performing in the same way he did in 2020, but that other teams, other managers, have adapted to neutralise Ralph's tactics when playing Saints. That's where the challenge falls at Ralph's door - can he adapt too? Does he have a Plan B?
He isn't irreplaceable, and even if the club has a long-term vision, there are others managers who play gegenpressing football that could deliver that vision if he left.