I think it's well passed
becoming...

To be fair though, the old MTB I had was no fun on the road, slow, cumbersome and you were in far too much of an upright position (it's windy round here). For the riding I like to do, a gravel bike is the right tool, I don't want to throw it down mountains, nor take it to trail centres. Would I like slightly less battering of the wrists, over potholed tarmac, or hose hoof cut up bridleway? Absolutely. Do I want one of those forks? No.
I think the range of gravel bikes is just widening. Some will overlap more with road bikes, and will be horrific on anything remotely gnar. While others will overlap with mountain bikes and be slow and ponderous on the road. You pays your money and takes your choice. Like that famous druggie said, it's not about the bike...
Road / CX / Gravel bikes with MTB forks just look wrong though.
There are theories at the bottom of my jargon.