….i just posted he’d done something decent in training and got shouted at

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We’re all agreed on this, we want him to be good.
He's probably scored hundreds of goals in training like that.
Dyche isn't the messiah, but he's not keeping Chermiti on the bench if he's regularly outperforming the two guys in front of him that couldn't hit the ocean from the beach. Self preservation is the greatest motivator.
We have a history of ruining strikers by pushing them in too early, we did it with Rondon and Maupay, when they really should have been subs or playing off Dom (we could also name practically almost any other striker who played for us who may have had a purple patch but then went downhill thereafter). These were seasoned PL players and we broke them.
Doing it in training is one thing, the defenders aren't trying to play mind games, aren't trying take their head off and there is zero pressure. Thrust Chermiti up front as our goalscoring saviour and he doesn't hit the net for a couple of games then the pressure builds, by 5 games we are calling to "get him off, he's crap" but in more colourful language. By 10 games his confidence will be shot and likely he will never play for Everton again. He'll leave and score goals for another team - just like what we see with Maupay at Brentford who's now putting up the numbers we expected and would have been happy with here.
Dom has strength and good hold up play, he defends well at corners. Beto brings unpredictability, with again raw strength. These two have experience on their side and should be carrying the can whilst they are not injured or suspended. Given that I can see why Dyche is holding back Chermiti. I would like to see him get more minutes but as I've said before, it's not like we are winning games 2/3 nil and then asking Chermiti to come on and get a fourth when the opposition have mentally checked out and we are playing ole football.
The kid needs the right opportunity if we are to see the best of him unless we are ready to throw yet another player on the scrapheap.