I think it is an issue of timing. The owner has made mistake after mistake. The infrastructure to support any manager must surely provide better players, both incoming and current. Its a chicken and egg thing. Gerrard had a decent infrastructure in place when he went to Rangers, and proved he could manage. He had a failing team and infrastructure at Villa, and was on a hiding to nothing. Lampard wasn’t neither good nor bad at Derby, and benefited from a honeymoon period/past rep at Chelsea but subsequently failed there and at Everton.
The Everton team is dire, and not helped by selling Richarlison. Recruitment is poor at best. The owner is way too hands on and is part of the problem. Where do they go from here? Personally, I’d appoint a manager to the end of the season. Hope they stay up, and use that time to, a) overhaul the infrastructure, b) appoint a decent manager, c) splash the cash in the summer. But will they stay up? Hope so but I fear this might be the season they go down, and they look the least likely of any time I’ve seen to bounce back.
A sugar daddy owner could make a huge difference, but I don’t see the current owner/crew doing anything other than consign Everton to a long spell in the Championship.