I’ve been riding a few years on a HT and have recently built up a Mega FS. Only two rides in but loving it so far, BUT i won’t be getting rid of my trusty 456. I do a real mixture of riding from natural trails, singletrack, jumps, urban obstacles, DH runs and trail centres and whilst my 456 was OK for them all when it gets rough and rooty i felt i was really at the limit of how fast I could go on my bike.
If you can afford it (not just to buy, but maintain also!) and want it then why not? It’s much easier to carry speed with a bit of extra boing.