Personally I highly disagree with the idea that the older games had more content.
They had different content sure, but a bigger shop is just a bigger shop. If you own everything, it's still got nothing for you. And it's just shopping. Plus, it only took a few months to fully unlock everything. The fun of upgrading shops would have lasted us until the summer, when we were all still playing and having fun anyways.
Brewster added no more than 3 minutes of playtime per day. And he only had like 4 items to give out. Its a stretch to call it content.
The club gave reactions by bringing fruit there each day. Once you owned all the reactions the building was useless for 6.5 days a week.
Katrina took 1 minute of your day.
The island was a good way to make fast money but all you did there was catch bugs and fish. Its not exactly something we are missing.
There were minigames that... yes okay those you can consider real content and we are missing that.
Gyroids I personally don't like, but they did take time to dig up and if you wanted you could keep track and try to collect them all. So I'll count that as something that would add to the game.
I could be missing some stuff so let me know if i am. I purposely did not include stuff like shampoodles or the post office because their exact functions are in the game.
New horizons also brought a lot of new stuff to the table in terraforming and crafting. So it's not like the game just took away and never added things to it.
Would I like updates and new content? Yes of course. There is no reason for me not to what new stuff.
But I find it disingenuous to pretend that older entries were drowning in so much content that after a year and 3 months you had so much more stuff to get on with.
I have never played an older game for more than 4 months because after everything unlocked and paid off, there really is nothing to do.
So im fine with waiting for any updates we may or may not have gotten because the game is not incomplete, its not lacking, and it was very much worth the price we all paid for it.