[firmgently]

I use mbasic and can reply to comments on posts.

I just checked the details and (for example) I click under the post: "2 scratches 'pon wood" (sorry I have language set to Pirate but it's the equivalent of "2 comments").

This takes me to a page showing the post, comments beneath, and a text field for me to reply into.

So it's there, just check the various links under each post to see what's available. Actually I've yet to find anything that I can't do on mbasic. I've thought something was missing several times (turning off notifications for specific groups springs to mind) but always found a way to do it eventually. It's often a hideous UX but I like how ugly mbasic is, it's FB without the sugar so you can taste how bitter it really is :) (for anybody wanting to say something like "if it's so horrible why do you still use it", it's something I do reluctantly because I have a few geographically distant friends who I like to keep in contact with and who always message me through FB)