>> Minimalism is an ostentatious luxury.
Those are separate things. Minimalism would be the opposite of buying things that are easily replaceable. Surely you would buy things that don't need replaced often/can be repaired and are higher quality/more expensive.
Using plastic dishes, throwing them out after every meal, and buying new ones isn't minimalism. Spending money on 4 good quality ceramic plates which will last the next 10 years is.