There are a couple of reasons why I didn't want to make MFT the default.
a) It requires admin access.
b) It's NTFS specific, which means you need to write different logic for other file systems anyway.
c) It's not officially documented or supported by Microsoft. It was reverse-engineered.
And then there is literally instant, for literally everything, while the app itself is in normal mode and thus preserves the non-admin benefits.
a) Not for the app, only for Everything
b) Those other file systems could also be indexed by Everything (though via a slower mechanism). Also given the primacy of NTFS, I'd definitely trade the ability to have folder sizes for drives I rarely use for the instant calculations on drives I use all the time
c) Good. Waiting for MS docs could mean a few more decades of wasted potential