That's all true, but what makes MSR mostly unique is the diversity of it's winners. Everyone can win it if you're in decent shape, that makes it interesting. Putting in Manie won't change the final, it will just make the race a bit harder, and thus a bigger chance for Pogacar to win it. That's the only reason why this is even a discussion at the moment.It’s a great event primarily for its position in the calendar as the opening monument of the season.
If you swapped it with Lombardia the level of hype and prestige of both races would swap over entirely.
MSR is a curiosity in that it is simultaneously the longest race in the calendar and the one most suited to the YouTube era where a highlights video can safely just show the last 30km of the race in full and rarely miss anything of note.
I love it but if people are being honest it is a great final but not a great race overall as it is not must watch from start to finish like Flanders or Roubaix.