Even ignoring the subjective reasons for wanting more upgrades (aesthetics, the sense of accomplishment, and just following the tradition), there's still a major reason why more upgrades are objectively better. Nookington's has many more items available for sale than Nook's Cranny 2.0 does. That alone is a reason to be annoyed with the lack of upgrades.
Do whatever you feel you need to do, but I would like to point out that all the museum upgrade does is allow you to donate art, which you can only get from Redd, who probably appears randomly once a week. There's a decent chance that you won't even have a piece of art yet by the time your museum upgrades, and even if you do, it's not like you're really missing out on anything if you have to wait to extra days to view that one single piece of art.
I like it enough. My personal problem is that I'm way to nostalgic for Wild World/City Folk's hourly themes, so nothing will ever compare in my mind. But I felt the same way about New Leaf at first, and I now find myself nostalgic towards that music as well.
On a related note, I really like 6 PM, because it sounds a lot like a track out of City Folk.