I think there's a big difference between bringing up the fact that this thread gets bumped solely as an Ole vs Poch debate that I find dumb, and actually making it about Ole vs Poch as you've tried to suggest.
People can expect whatever they want, and you can have a coach that turns thing around for the first few weeks/months a la Ole and Tuchel, but at some point the honeymoon goes away and the team regresses back to the mean.
I have no feelings towards Poch either, I wasn't excited when I saw his hiring, because managers don't really excite me to begin with. As far as their shape before he took over, they weren't in first place then, and they're still not there today. Tuchel got fired because of performances in part, but mainly (at least I suspect) because he got on bad terms with Leonardo the sporting director and has rubbed some people the wrong way, as he tends to do over time at every club he's been in. Short of an absolute meltdown in the squad because of Poch, I don't see any way he gets fired by the end of the season, even if PSG win nothing else this year. He should be given the chance I'd like every manager to get, and see how they perform next season.
That being said, I don't think any season can be a write off, it's too easy to say that, but it's definitely a weird season across Europe as I mentioned in what you see in the French and other leagues around. The usual steamrollers aren't steamrolling teams, it's very hard to get any sort of continuity if your players are either injured or suspended. This whole team (PSG) is built around a player that can't stay healthy. I wonder where United would be if Bruno was always gone, it's the same concept with PSG. They've managed to beat a poor Barcelona side without him, but let's not have that trick people into thinking they're a solid team, they're simply poor and it would be a miracle for Poch to get them past Bayern, never mind into the final. I guess they could go as Real Madrid did in Zidane's third season where they're terrible in the league but somehow find a way to win in the CL, but it's very unlikely at this stage, and with the teams they are going to face in that competition.