Most of the content on reddit is created by power users who are more likely to use 3rd party tools. Most people who use the official app only consume content.
Then again. I hate using my phone in general, so I always think that any content creators would use desktop and maybe old reddit.
I can type just as quickly on a phone as I can on desktop, and in many ways I prefer it.
Imagine a free music festival with zero security. It would be chaos and the volunteer artists would stop performing.