[trhway]

It is worth it when it is done right, i.e when you do correct market differentiation (see my other comment here on Mercedes) to avoid your low end cannibalizing your higher end. This high margin really helps you, and this is why almost everybody does it. EVs are probably even better suited for it given that the platform itself is easier/cheaper to share between the low end and the high end - thus the current Teslas S/X story looks even more of a failure as by releasing 3/Y that similar to S/X (that probably helped a lot with 3/Y sales though) they forced themselves into the need for a very significant (expensive) redesign of S/X while having very low sales of it.

[panick21_]

The big issue with S/X was that they were not luxury enough, in terms of performance they were fine. So the redesign was mostly needed in terms of interior quality, materials and so on. Not that crazy expensive and something all other car companies manage to do.

[trhway]

I see it differently - they needed to redesign everything except the power train. I.e. in addition to the interior, externally it should have been looking way upscale from 3/Y. Giving that their design language is already almost 2 decades old, they needed (and actually would still need it for 3/Y max 5 years down the road) to have a full redesign for S/X similar to how BMW did with 2002 7-series trickling down that design into 2004 5-series and 2006 3-series (or like Mercedes did with S-class in 1996 and trickling down that to E and C later)