Here are some factors that might explain it:
- By far, it has gotten way easier to legitimately develop games via official means. Most developers would rather take a bit more effort to go the official route and get more publicity as opposed to making a game for a limited audience. Plus, with consoles constantly being updated, your audience has to go out of their way to hack their Switch just to play your game, a turn-off for many.
- Development tools. While we have stuff like GDB Stubs and emulators for the 3DS right now, that took a lot of effort to implement, and wasn't released until near the console's end of life. The Switch, more likely than not, won't have these tools available when Homebrew first becomes widely available. Plus, unless someone takes the effort to port Python or Lua to the Switch, devs will have to program in C or C++. In an age where you don't even need to know programming to make games anymore, this might be a huge turn-off for some devs.
- General lack of interest? A lot of people who would've been into Homebrew games a while back may not be so interested now, having matured quite a bit. They may dismiss such games as childish or amateurish, compared to official titles.
- Smartphones. Back when they weren't a thing, the idea of using your DS as an alarm clock or calendar was novel, and enticing to many. Now that smartphones are predominant, not many people want to hack their Switch consoles just to get them to do what smartphones do best. Because of this, probably less people are in the hacking scene as a whole.
With all that said, I do see how you feel. Coming from someone who first learned to program using a small DSi app called Petit Computer (you may remember it), I miss the days where people could release weird and wonderful Homebrew apps to at least mildly interested audiences. It's sad, but times are changing.