but that's not my point, the supra is toyotas premium car so I bet they could've very easily pulled off a decent interior if they wanted.. aka lexus LC style etc.
Which they have done by sharing the platform and interior elements with BMW???
That's about as easy as it gets without massive investment in their manufacturing. BMW is the premium manufacturer here not Toyota, so Toyota are the ones who have done well out of the deal. It's not like they partnered with Skoda / Nissan / Renault / Ford etc.
The quality of the previous Supra interiors was typical Toyota so they could have stuck with their current and historic design philosophy on these, charged the same (52k) and probably not faced the faux criticism.
Just because they have Lexus under the group doesn't mean cross development and manufacturing would be commercially viable.
The Supra was / is a big risk for Toyota. It's double the price of the GT86 (after current discounts), it's over 18k more than a discounted Nismo 370z, the same price as a Porsche Cayman with a couple of options and a little bit less than a Cayman S. It's also more than the Z4 albeit they are roadsters.
It's also creeping into the new more luxury coupe market C Class/Lexus RC/Jag F Type etc which is realistically going to be where the 80s/90s fan/owner base who would be actually spending 50k plus on a new car are now at an age and that demographic where that money is going.