Why is it mental. The club has shown time and time again that top 4 is pretty much their main focus. Ole was given time, money and and extension despite showing little to no signs of being a manager that could compete with the likes of Liverpool and City.
If we had got top 4 and RR hadn't been so public about our mess then I think Poch would be coming in this summer and it would largely be business as usual. Few players in, don't rock the boat, rinse and repeat in a few years.
You're thinking of the top 4 result in isolation rather than the broader implications and impact. In isolation top 4 is great. Who wouldn't want CL, more money and being a more attractive proposition to players. If that top 4 result means that you don't do the proper rebuild that you need to do with the right manager then its not good.
Sometimes you need to hit rock bottom before you have the will to build yourself backup.
Who knows honestly. Its all whataboutism. Maybe we appoint a different interim, get top 4, the massive clear out still happens, ETH still happens and everything is great. Who knows. I think its far more likely if that happened we would have hired Poch, told him to work with what he has got, bought a couple more "star players" and still had the same rotten core to the squad.