I do actually have some problems with Y-Comm's UI in terms of the UX. Specifically every time you enter a Max-Raid, it's pretty much a gamble to see if it's closed or not. They should change the UI a bit for the Max-Raids stating how many people are in the rooms and state if it's open or closed. This is simple stuff you find in Monster Hunter's online rooms, here in Pokemon the details are hidden away from you. All the more reason you can tell that not only is GameFreak new to consoles but still new to online even though their online multiplayer is smoother in terms of lag compared to other Nintendo games.
I suspect that online functionality was rushed overall. I've mentioned it before, but I think the Y-Comm was originally meant for face-to-face interactions in medium-to-large groups, of several people or more. It would explain why notifications involving Max Raid Battles look exactly the same regardless of if the raid is recruiting, it's already underway, or if it's already completed. If you're physically there with the other people, you can look over or ask to see how the raid is doing. It also explains why you're flooded with notifications that you can't interact with directly. For instance, the one about camp or about curry are supposed to encourage you to find who sent that notification and ask them if you could join. It also explains why they opted for Link Codes instead of searching for specific people on your Switch friends list. They didn't think a 4-digit code would yield false positives because anyone else using that code would be too far off for the Switch to find, and they probably figured the 4-digit code would be better because it's easier to say compared to the alternatives.
I also suspect there was going to be some other feature in
Pokémon Sword and Shield designed for online interactions, but it couldn't be completed in time, so the Y-Comm was repurposed to do both online and offline.
That being said, it is possible that there are people high up at Game Freak, or more likely The Pokémon Company,who genuinely believe that the majority of interaction in Pokémon is offline, considering there have been a lot of commercials in which various people meet up in person and find a common ground in Pokémon.