They spent 450m on players and the only fundamental change was the keeper? That is impressive. The rest of your post...I have no idea what you're even responding to because you just made one hell of a strawman.
City spend massive money for the past 10+ years, I'm not sure what your point is? They spent many hundreds of £m's since then and haven't made a fundamental difference to how they play. I appreciate you're just trying to twist words now rather than debate the actual point but I will explain one more time - there was no fundamental changes (barring the keeper) to the City side that won the title under Pep than was there before he arrived. The spine of that side was there before him. Yes, they spent a lot of money (as they always have and will) but they didn't make wholesale changes to how they played or their line-up. They've continued to spend money, making incremental improvements and or replacing players in the years since but there hasn't been a 180 in there.
As you always do, you're defending every criticism anybody throws at Utd to the point that I'm genuinely starting to question why Utd have been so bad for so long - after all everything is hunky-dory. You're objecting to the point that Utd will have to make wholesale changes before they're able to challenge again and you would because you've previously defended all of De Gea, AWB, Maguire, Lindelof, Shaw, McTominay, Fred, Pogba, Martial, Fernandes, Ronaldo and pretty much every Utd player when I or somebody else has said they're not good enough and or suitable.
As I said, if you think Utd are only 2-4 changes away from challenging then good luck. Before Utd win another major trophy, the Utd side will look completely different to what it was last season. I suspect it will look completely different to how it looks next season too as you're probably a good few years and possibly managers away and no doubt your next manager will play completely differently and will be wanting to sell your potential new 4 foot CB.