So I needed to edit some video for our product owner. Spent four hours with that fresh modern Natron ( https://en.wikipedia.org/wiki/Natron_(software) ) UI, only got half of job done, and the rendered .mp4 did not even play in standard players.
Had to resort to old-school AviSynth (+FFmpeg input plugin +x264 +mp4box). Did the job in half an hour and 30 lines of AVS script, spent another half an hour making it look even nicer.
It's a wonder AviSynth still works in 2019, being built on legacy outdated tech.