First time hearing of this and geez, it's 178MB?! Meanwhile, Executor (in it's 16th year of development!) is only 1.8MB. That's nearly a 100 times smaller than Flow, yet with a ton of more features. Just what the heck is Flow coded in?!
It's a indicator of bloat and lazy coding, which is typical of certain platforms such as Electron or UWP apps. Anyone who's ever used Electron apps for instance knows how much they suck.
I prefer Launchy which is very lightweight. But regardless of the tool, this is the best way to navigate your computer. I've literally forgotten how to get around to files and folders without it.