Haven't tried myself, but did you try Kdenlive ? apparently it's very good. I use Blender for my editing needs because I'm so used to it, it isn't bad but a little quirky. (always with Blender)
I used a bit kdenlive (and no experience with professional grade productsm, IMO it's a sufficient alternative for a home project, where the most advanced effect you'll need would be a green screen.
But feel like these professional grade programs are "blacked magic" compared to kdenlive. The few video tutorial I've seen show they have crazy effects. Not a big deal because I have no idea on how to use them, but definitely an issue for a pro.
For an amateur but proprietary the gopro app is crazy, you give it a few rushes, choose a music, a target social media, a style and on 3 click you have a video ready to be published
As an editing program, it's not really supposed to have much in terms of effects... usually for anything beyond editing and color grading you'd go for a compositing program such as Natron, Nuke, Blender, etc.
You're saying it does color keying though ?
Correct it includes colour keying, and some basic image and sound filter.
For an amateur who want to edit video 4x a year, having some basic effect included is great. This is where TikTok/cap cut is great and win in the public heart, in 2 clicks you have a nice face, look 10 years younger, and not like someone who was in night club the whole night and already has grey hairs. As a user, I want a suite which can do everything easily rather than needing 3 softwares.
Premiere is a crashy mess compared to Final Cut. Davinci isn't open source, it's just free unless you need to do 4k and some advanced colour stuff. Davinci is high end Hollywood magic.