If you set aside bragging rights, they really don't need the S/X in the lineup. The 3/Y and trucks are the future vehicles that will make or break the company. Until the last half of 2018 the S/X were carrying the company, but the Model 3 began to dominate sales and has become the main bread winner. The Model Y is going to expand this even further.
The $100K vehicle market is a niche, it's never going to be very large and it's going to get very crowded with EVs soon. Tesla would be better off dropping the S/X or moving them downmarket. The $60K market is much larger and they can be competitive with the S/X there. Though it may still be more profitable to build more 3/Ys and drop the S/X for a while.
Tesla is in a position where it needs to maximize profits, both to keep the stock price up and to fuel future growth. They need to look at how much profit each square foot of factory space is generating and if converting the S/X lines to Model Y production will bring in much more profit, then it would be foolish to keep the S/X on the market right now. This will disappoint a relative handful of people who want an ultra-luxurious S/X. I don't think a majority of S/X owners want an ultra luxurious edition. I'd like a bit more cabin storage in mine, but that's about the only thing I'd upgrade.
All the gadgets in European luxury cars is fun to look at in a Doug DeMuro video, but it's nothing I want.
The top trim model of the Ford Fusion in the US has a base price of $40K. I suspect it's a lot like the Vignale, or possibly the Fusion Titanium which starts at $34K.
American luxury cars sell well in China, but China is a completely different market than the rest of the world. It's the fastest growing with a large number of first time car buyers which is a completely different playing field. In developed countries almost every car buyer is coming from another car, some are upgrading, while others are moving to a newer version of the same car. Developed countries also have large used markets and every new car is competing with used vehicles which are just as good in most cases.
Lincoln and Buick probably would have been discontinued by now if it wasn't for Chinese sales.
I did look up GM sales in Europe. The numbers differ a bit from site to site (probably because different sites include different mix of countries), but since the sales of Vauxhall and Opel, GM sales in Europe have been tiny.
Here's one site:
General Motors European sales figures
and another that breaks out models:
Sure, GM Europe Is Gone, but the Automaker Hasn't Entirely Pulled up Stakes - The Truth About Cars
Bentley sold 5X more cars in the US last year than Cadillac sold in Europe. MCLaren sold 2X more cars in the US than Cadillac did in Europe. I don't know why GM is even bothering, but it's clear they aren't really competing in Europe right now.