As I said upthread, a lot of X owners love the way the Falcon Wings make getting their kids in and out of child seats a pleasure and not a back-breaking exercise.
That is only one use case, though - child seats in a high top clearance area. Making a high volume car around that one specific case may not seem necessarily the best idea. People with kids of certain age and suitable parking area. I mean sure there is a market, but is it the best market reach? Would a SUV without them be an overall more practical/liked car?
For the rest, without the argument of easier entry to third row (already much reduced in production Model X, not as easy as prototype) it is only that one specific case against a long list of practicality negatives.
No roof racks, harder to open in many garages (offset a little by easier opening in some scenarios), limited interior height due to structure needed in roof, complexity, slower operation and cost, makes opening sunroofs harder to have, doors not practical for storage/drinks, no support from the door when exiting (elders)... Heck, the speculation is even folding seats are harder to implement due to them (seatbelt attachments), though that I expect solved eventually.
That leaves child seats (outside of many garages) and emotions. There is the coolness/halo value for the owner and Tesla to an extent. Sure, many want them, me too for that ubiqueness. At least while the idea is sort of new. And Elon's stubborness to see his vision true is what drives them for the moment at least.
Can you think of other benefits in an FWD Model Y?
Model Y may well come with falcon wings. But it is far from a proven overall good idea - let alone a lasting idea. The jury seems very much out on whether or not the falcon wings are as practical an idea as they originally sounded like.
Also, some suggesting people who dislike falcon wings should just buy a sedan/hatch ignores the many benefits SUVs in general have in the eyes of many: easier entry, safety and visibility through higher ride and interior height for example.
The market for an EV SUV with regular doors may well be larger than for one (let alone two) with FWDs - and that's the FWD dilemma overall.