A significant amount of content coming from a recording monitor for professional cameras, or in-camera itself, usually in ProRes/DNxHD form. Using an NLE for transcoding is miserable, and ffmpeg doesn’t have the most intuitive CLI syntax for people who just want quick buttons to press.
Pro-world also uses transcoders, and not everyone likes/is able to use Adobe for that.
Oh, there definitely are better tools out there, I’m just saying where the source material is coming from. Transcoding specific apps are relatively far and few between, so we end up having to use use other apps for this at times. Handbrake, ffmpeg, Apple’s Compression (is it still alive?), Adobe Media Encoder, etc. Having to use DaVinci Resolve, Premiere Pro, Medi Composer, etc to create proxies or flip between formats is overkill and time consuming.
FCPX has been going from strength to strength since the release, with a constant stream of big updates, and winning lots of hearts back from the FCPX backslash.
Pro-world also uses transcoders, and not everyone likes/is able to use Adobe for that.