tl;dr bots are more like websites than mobile apps in term of first user experience, so won’t suffer the same fatigue as apps

I actually think bots are more analogous to websites than mobile apps in this context. While they are well-suited for mobile use-cases, but (can be) distributed, discovered and consumed like websites.

A user may only use 5–15 apps in a month, but they will visit perhaps 100+ websites. Why the difference? Out of the 100+ websites, only a few are destination sites, the rest are discovered via search, social media, etc. Because of the install/register friction of apps, you just can’t consume them in the same way.

Soo…..to overcome fatigue, bots should/will be searched, discovered and surfaced like websites and other content and then get out of the way until next called upon.

The other thing to consider is that bots can be deep-linked. Long-tail apps can’t since they require an install/register step before first use.