Poch finished 3rd with 70 points in a poor season where everyone of note bar us and Leicester underperformed. AVB finished 5th with 72 points in a far more competitive season at the top end. How's that for the relative worth of finishes? It's a pet peeve of mine.
I don't know if Poch can produce better than Harry and AVB with better players across the board - we'll have to see if he can. But let's not pretend as if he's been handicapped enormously in comparison to those two. Harry had Modric, Bale, VdV and King as his world-class players - AVB had just Bale, with Lloris coming into it as the season progressed. Poch (I'd argue) has at least Toby and Lloris, and very possibly Dembele when he's on form (I think he has a ridiculous success rate in terms of dribbles completed and possession won, the highest in Europe iirc). Plus, he probably has the same squad level as AVB and Harry did. He might well be at a disadvantage compared to those two, but it isn't as overwhelmingly large as his more ardent supporters like to claim it is, imo.
I bring up this comparison because I feel it's still valid in terms of the effects those managers had on breaking our crippling mental blocks - each of them took a large step forward in their own unique ways. Poch has also done so, but in a far smaller manner, and the unbelievable collapse at the end of last season still (imo) calls even that into question. And as for United 'firing', they were crap, and have been crap the whole goddamn season. If this is what a 'firing' United side looks like, I'm sorry, but there are many, many teams that they will struggle against.
Not against us, though. Not when there's something at stake. There, they'll easily win these crunch games without breaking a sweat, while we withdraw into our shells and look every inch the submissive, eternal bridesmaids. *That* is what I feel Poch has to overcome, which he has not yet done to any significant degree - his more ardent supporters claim he has, and my counter-claim is that he really, really hasn't.