I might understand if United were comfortably mid-table and showing few signs of improving, except those two trophies and league position are indicative of a side on the up.
7th, 4th, 5th, 6th last 4 seasons and yes we know, two cups this season, but look at the competition you faced, most top teams would also have won them with those draws, not exactly top drawer, or even second drawer (yes of course you can only beat what's put in front of you but that isn't the point).
So have United progressed as a team? I actually find that very hard to assess with any degree of certainty, gradual improvement perhaps ? Whilst Spurs, Chelsea and Liverpool have measurably improved and City seem only to need to sort out their defence (having released 4 players that is happening), and maybe strengthen one slot in midfield too, to be a power next season.
I'm sure people will say ... yes, yes ,yes but we have
Mourinho and
two cups ! However let's not pretend that United had to beat the best, or even just very good, teams to those trophies, City the only top rated side in 11 rounds of cup matches ; Northampton, City, West Ham, Hull (inc. losing away) and Southampton (and even that win was due to poor refereeing perhaps) then Zorya Luhansk, Fenerbahce (lost away), Feyenoord (lost away), St Etienne, Rostov, Anderlecht and Celta Vigo (and then only due to Guidetti missing a sitter from 6m in the 96th minute that had the whole of RedCafe saying .. how the feck did he miss that ? Thank God !). United have really just fallen over the line in both cups.
So let's look at PL form and especially look at United's games against other Top 6 sides : W2 D4 L4 (and add two draws vs. Everton if you want to make it Top 7). And finished 24 points behind the PL winners (15 pts last season) and 7 behind 4th (we can say a virtual 8 as GD is far inferior). We can chat all day about players bought and sold but in B&W there's precious little progress there despite Mourinho's rhetoric.
Next season ? Personally I want to see how the Summer transfer season goes before making any forecasts. Carrick has signed a new deal but for me you need a new CM there, and will Ibra stay ? A lot depends on Griezmann, he would be very good for you but you need more than one striker havin lost Rooney and especially if a 37 yo Ibra goes. A CB, LB, CM and at least one, should be two, strikers ... however United have said 3-4 inbounds so you may come up short if that is gospel.