This. I tried out Flutter Flow a few days back. I was able to do a ton of boring design work very productively, as well as the Firebase integration gamut, but I can't see myself coding app logic with the existing setup.
For layouts and basic UI, definitely. But backend integration was a bit convoluted and I think difficult to decipher by design. Like if you expect to just do the stuff on the web app, then download code and make changes, nope not going to happen. You'll have to spend some time with each of the files you downloaded.