This is ridiculous. Not only does Mozilla support BYOM with Smart Window, but do we seriously expect your average user to be able to locally run it with ease?
Imagine for a moment the complaints that would arise the very next day because their browser is now revving up their laptop fans and hoarding precious RAM.
Local models aren't yet light enough to handle the required processing at the lowest end, so Mozilla chose the most responsible stewards they could find. There is no news here.