United's reputation makes it a more dangerous job for an ambitious manager to take because they clearly have not had the recruitment structure in place to properly support a manager for over a decade, they have woefully dated facilities in dire need of serious short-term resolution (particularly Old Trafford which is seriously falling apart) which will no doubt have an impact on their ability to spend on players in the short term, not to mention the INEOS minor stake purchase has come with a ton of negative publicity due to Sir Jim's 25-point cost-cutting plan, and even with all that in mind the fans still expect to be competing for the title and back in the CL within 2 years.
Compare that to Spurs fans expectations; if Iraola came in, secured top 10 this season, top 6 next season with a decent cup run then had us challenging for top 4 within year 4 of the project, with some of our current youth players starting to mature into nailed on first XI players, would our fans be calling for his blood? No, we would be glad to see positive progress back to our financial "mean" position in the table, and to not be the fucking laughing stock of the league again. Put that development plan to a United fan and they'll tell you that's nowhere near fucking good enough for a club their size and they'd expect a new manager to be competing for the league by year 3. Even considering that I would say on paper our first XI is better than theirs in probably 8/11 positions.