Goals conceded doesn’t mean bad goalkeeper. Aaron Ramsdale was relegated two years in a row and conceded bucketloads, now he’s one of the best in the PL because he’s behind a competent defence.
Cooper needs to command his box better, particularly at set plays, but he’s an excellent shot stopper and his distribution is largely very good (particularly his throwing).
More to the point, last year was his rookie season in football and L1. A more reasonable assessment is: Has he improved this season? Are we conceding less? Is there evidence he is getting better at the things he struggled with last year? Can we compete with Cooper as first choice? The answer to all of those things is yes.
I've said very similar things already in this thread and others. Conceding goals is not solely the fault of the keeper, that's obvious. Agree also that he's a great shot stopper and his distribution is great too. What I would say, and I've said before, is that quite often a shot will fly past him and I'm sat there thinking "how did he not get to that?". He often makes great saves, but he also doesn't make the saves you don't expect him to make. The ones where you think "a top keeper would make that save". The saves he makes are within the realms of those that a decent keeper would make. Only my opinion of course.
Regarding the questions you've raised:
1. Yes, he's improved this season.
2. Are we conceding less? Not since we lost Galloway - is that Cooper's fault? No, but we're now missing the protection Galloway offered from balls into the box, so we're back to where we were last season in that respect.
3. Is he getting better? Same question as the first one really!
4. Can we compete with Cooper as first choice? Yes but as above, I think we'd been protected from Galloway's excellent prevention of crosses into the box, and we're without that now - hence, Cooper's weaknesses are being exploited once more.
We all know that Cooper lacks physicality in the 6 yard box - he simply doesn't have the presence to claim crosses. Our only option therefore is to stop them coming in and that's what Galloway was great at. That's where part of the problem lies, in my opinion. Set pieces are another one but again, it's down to being able to command your 6 yd box and claim the ball above everyone else. At this level it's a complete bunfight every time the ball comes into the goalmouth so we need someone who can punch it clear or claim it outright. I very rarely see Cooper doing that successfully, yet it's a fundamental part of a keeper's toolbox.