Luxury car brands are not major auto manufacturers by themselves, they're owned by them.
A Rolls-Royce is a BMW. My M4 had RR chimes in it's hidden configuration settings.
A Lamborghini is (usually these days) an Audi. The Urus is a Q8 and the Huracan is an R8 (or the other way around, hard to keep track at this point)
A Maseratis has an infotainment system out of a Jeep Cherokee and shares transmission bugs with a Chrysler 300
Their brand cachet doesn't matter to this conversation because they're not the ones who control its application. The "boring" parent company will.
And why will the parent company do that for their ultra-luxury brand that's all about image and not their normal cars? They won't.
So the parent company needs to have a reason to go to Tesla.
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A skateboard is not just a drivetrain, it's the entire platform.
Manufacturers have just spent millions and billions in R&D to develop modular platforms that can do things like transition from ICE to BEV without feeling like an electrified ICE.
They're going to throw that away? Because their margins on batteries aren't quite as good as Tesla?
Lol if that's the case I think the last thing that helps margins is having someone else provide the whole platform.