its not… the iPad can do wireless midi , it uses rtpMIDI
unfortunately rtpMIDI has a bit of a chequered history outside of Apple, where the drivers for other platforms have been left to ‘rot’ a bit.
I think the main ‘issue’ was over wifi the performance was a bit ‘unpredicable’ , so timing was not very tight.
I think now the emphasis (for wireless midi) has instead moved over to bluetooth… ive not checked the status on the latest linux kernels, but Id suspect they will have support for midi over bluetooth.
as has been stated, Link is focused on synchronising different machines and its really great for that, because midi clock sucks!.. its highly unlikely thats going to ever change, as its a solution to a very specific problem.