Tesla is very obviously chasing the BMW market with the Model 3 and Model Y, which represent the 3-series sedans and X3 respectively. You can see this when you

Tesla is very obviously chasing the BMW market with the Model 3 and Model Y, which represent the 3-series sedans and X3 respectively. You can see this when you compare prices and specifications (cabin size, curb height, HP) of similarly-outfitted vehicles. The next level up in BMW’s SUV lineup is the X5, which begins at about $60K and goes up to about $82K fully loaded. Whereas the Tesla Model X begins at $80K and can go $91K or even $100K if you get the options (I’m not even talking about “Plaid”, which is $120K.) So TL;DR the Y is more popular than the X because it’s a much cheaper car (when equivalently optioned), and the X is competing with a much more expensive category of luxury SUVs.