Before LumaFusion and some of the more recent iPads with more powerful processors, I would say it was a sub-par experience. You can obviously still do more with a desktop and Premiere, Vegas, After Effects, etc. but you can do quite a lot on iOS now, and it’s a good experience with good results.
I do FiLMiC --> Import to LumaFusion (pretty much instant) --> Publish straight to YouTube. All in one.