Low effort post, but I'll bite anyway.
I've always believed trainer games had untapped potential. They can potentially offer more customization than most other genres, and are basically the perfect medium for corruption, slavery, mind control and petplay.
Beyond that, I believe one of, if not the most important part of a game is the characters. Even if you make a good game, if the characters don't click, then the game is mid. Alternatively, a great character can make a bad game feel mid, or even good. A trainer with great characters off tremendous opportunity, when combined with good customization options, being able to change the character to fit your preferences, I generally believe it would pop off.
Lastly, we shouldn't ignore the historical context either. Some trainer games, most notably Akabur and Teaching Feelings, have brought a large number of new players to adult gaming. Some of those players may have gone on to make new games, while others became new donators, or simply boosted player numbers. Either way, trainer games as a whole have helped this community grow, and I don't see any reason to get rid of them in case another breakout success comes along.
An example is that there is that X-men trainer game, the one that's basically trying to remake Rogue-like, but good. Xmen 97' has been a success, and with X-men joining the MCU, there will be more people looking for X-men smut. Some will likely discover the game. After that, it's only a matter of time until they discover F95, and then start playing even more games. Introducing them into the ecosystem. I see very few downsides to that.