Net spend over five years has us spending only a 100m less and they've won 2 FA cups in that time (5 in the last decade) in addition to finishing 2nd last season and have continued that kind of form this season. To have the remotest chance of competing against City you have to spend but also spend well. Sure you're entitled to the opinion of not liking them or the manager, we share that opinion but league standings + trophies are not opinion based. They're further on in their project than we are because of unsuitable managerial appointments lurching from one style to another in the hole of quick fixes. The patience shown after two 8th place finishes has paid off for them lot and we will likely have to show the same kind of patience until we can become vaguely competitive unless we just want to cry misfortune when one or two injuries in key places derail what makes the team function.
Not sure I fully get the Wenger point, Ferguson was hugely successful and you could argue that it's been tougher on the managers that have followed because of that success, just because a club has done well it doesn't make it easy to sustain that success. It can work both ways depending on the state of the squad and manner of the departure of the previous manager..
The Wenger point is absolutely the same as SAF
Both clubs had a dominant position in English football for 25 or so years, and the massive (exponential) advantage it gave them financially, both clubs tinkled that away (terrible mismanagement), and either of them winning a couple of domestic trophies in relation to that position is not success, and framing it that way is just PR.
I get sustaining success is hard, but when you have been dominant for two decades, where you challenged for everything, every year, to go from that to hoping to qualify for CL and hoping for an occasional trophy is failure. Sustaining that position, and/or regaining that position with a reasonable timeframe (2-3 years?) should have been a lot easier than Spurs coming from mid table to same point while having to build the infrastructure and revenue stream needed to support without having the decades of high income in the bank.