Once they release the wysiwyg I suppose. Have they? I haven't followed their development that much. It's not that easy to convince client on markdown (tho I've gotten a few falling in love with it.) A file-base system can be quite slow too if your site has lots of pages like 10k+.
Other than that Grav (and Kirby) had been a joy to work with.
I played with Grav for a short time only a local development environment. It seemed pretty slick and I believe Grav can be used with or without a database and if I remember correctly they offer an Admin UI plugin.