You’d need to order a Performance Model 3 or something similarly highly spec’d to trigger LCT (or have the $A sink to USD 0.50). Even then, LCT will slowly kick in as the AUD value goes over $75.5k. It’s not like all of a sudden you’re paying $5k more simply by going $1 other the LCT threshold.
As to whether LCT is “unfair and discriminatory”, at least it’s a tax that higher income earners who fell compelled to buy expensive cars as a status symbol can’t avoid, while lower income earners can entirely avoid by not buying expensive cars. Sounds fairer to me than the reverse. LCT certainly hasn’t slowed the sales of luxury cars over the past decade, as BMW, Audi, Mercedes and the likes continually boast about how many cars they sell here and how impressive their sales growth is.
If anything, to make it less “discriminatory”, LCT should be extended to all luxury discretionary goods that cost above a certain percentile for that product category, and include boats and yachts, designer jewelry and clothes, etc so that expensive cars are not singled out.