As someone who works professionally in a media related field, I can say: Yes, it can be technically and also creatively challenging to do some good editing work, but so many of the mistakes Ruby makes are due to pure laziness and carelessness. Sometimes you get the feeling that she doesn't even rewatch certain scenes to check if the editing works or if there's changes to make. That's because she expects herself to deliver excellent work right away which doesn't need corrections. A lot of these mistakes could easily be corrected, even by someone who's relatively new to this, and in case it doesn't work there's plenty of tutorials on YouTube, to the point where you can learn 3D animation.
Yeah, if you're putting effort in and trying to inject care and creativity, editing can be tough and time-consuming, but I've never seen any evidence that Ruby puts any effort into the editing process. She sticks with the most basic techniques and still manages to
duck her videos up in a dozen different ways and she only has laziness to blame. After 7+ years, she should've gotten better with practice even if by accident, but she's as bad as ever.
It's not hard to make sure you're not inserting a hard cut mid-word. It's not hard to do a second take when you're intentionally filming something for a video and you mess something up or there's loud, distracting background noise. It's not hard to adjust volume levels to make sure music isn't drowning out narration. But it would require paying a tiny amount of attention or double-checking the edited video before exporting and uploading, but Ruby simply cannot be bothered and thinks she shouldn't have to.
It's the same as when she moaned that editing writing is "mindless" - she doesn't understand that it's a vital part of the creative process that requires attention and is how people improve, because she thinks it's beneath her and she has nothing to improve on.
And funnily enough, from the comments of her latest video:
This must be the 100th time someone's pointed something like this out, but she'll never change.