Too subjective to get a definitive answer, even outside of stw!
For example, I see no bikes I this thread that I would be happy to use for everything I do, but I know very few folk would consider what I own ‘all-rounders’
The closest thing IMO is the current bottlerocket; with a decent spec it’s light enough to ride xc, tough enough to go mental and has neutral enough geometry to handle dj, dh, fr, xc, am, pm, ATM,rpm aa, rac etc… Depending on the skills of the rider of course :wink: