I mean, that's just relentlessly negative isn't it? But you thrive in that, the only time you're active on here is when you're having a moan. You'll throw in a couple of positive comments here and there so that you can point them out whenever you're called out, but ultimately all you bring to the party is abject misery. You really make coming on here a chore sometimes, such is you're spamming (that's the only way I can describe it) of threads with the same negative comment(s).
I'll indulge you though, even though I should know better by now...
Keane, to begin with, was bought as a young CB who hasn't progressed as much as hoped. He has still become a full international during his time here. He fits your preference of young player brought in to develop.
Mina, another young CB with international and CL pedigree. You're absolutely off your rocker if you don't think he can’t go on to bigger and better. He might not of course, but he's more than capable.
Bernard. CL level performer before we signed him. Again, fairly young and certainly not in the twilight of his career. Fits your profile again.
Gomes was a decent performer before the leg break and 99% of fans agreed with the signing, most saying it was a bargain at the reported fee. Mid 20s and approaching what should have been his peak before a really cruel injury. Has shown this year that he can perform in a balanced midfield.
Sigurdsson I'll accept is an albatross. However the fact he has been consistently picked by each and every manager suggests he would get plenty of league time wherever he went.
The point is though, without dissecting each of your points constantly, the reality of what we're seeing is a mismatch of players brought in to suit different playing styles of different managers (and different directors). That's why we struggle to have an identity, struggle to play with any fluidity and consistency. We are a product of too many changes in far too little time. The easy shout is to say "bin them all” and start again, but we can't. We can't afford it and even if we could we've already seen first hand what happens when you try.
Many will hate this but patience is the key, allow this project to progress and not call for change with every bump in the road. Some will suggest we've been patient enough after 18 months but in reality that's not a long time at all for a team to be moulded. This was a club that was flirting with a relegation battle before Ancelotti came in and now all we can do is argue about how missing out on Europe will be unacceptable and how it's typical of Everton. Pretty ridiculous really, especially when you take into account all of the external factors of this season too.
No good will come from ripping up the playbook and starting over. Again.