I've yo-yo'd for years between HT and FS.
I miss the HT as its gone now. Certainly missed it the other day trying to get my Enduro (still in in Alps guise) round Gisburn Forest! Either I've lost lots of fitness or my bike is really really heavy.
I miss the "having to pick a line" thing and whilst blasting through stuff on the enduro is great in a huge safety net sort of way, its not as demanding as a HT. Certainly my last spell on a HT improved my riding no end.
I always maintained that fs is a skill compensator.
I don't miss rear punctures (lardy chap who rides quite hard), chainsuck of my 456 summer season though.
I do miss the simplicity, the directness of drive, the weight, the distance I could cover on it, how easy it was to get up hill
That said, i sold the 456 frame and forks and bought a hybrid thing that gets a ridden to work and it flys…..compared to any mountain bike. 😀