[pjmlp]

I guess you never seen Haskell code in production with endless GHC feature flags...

[thesz]

I saw, of course. I use Haskell professionally for 15 years now.

These feature flags are not "architecture space odyssey," though. Usually they reduce boilerplate, often significantly.

They are also artifact of Haskell being "research language," as mentioned in video above.