Comment by mytailorisrich

The future perfect is very much used both orally and (especially) in writing and so is the past conditional.

The passé simple is almost never used orally these days, and in writing mostly only in literary texts.

I've noticed that the subjunctive is used less in writing since some change to 'simplify' (i.e. dumb down) the language.

Exotic forms of subjunctive (imperfect subjunctive, anyone?) are hardly used anymore even in contemporary literary texts.