High thread-count linens DO NOT have the serviceability of their lower thread-count brothers. Logically, if you take one square inch of fabric that has a T300 thread count, the yarns need to be thinner than if you have a T180.
The problem is compounded when you have to tighten the weave, to pack the yarns tighter. Adding a double “pic” to the warp will produce a higher thread count and more expensive fabric. The manufacturers tout their product as luxurious, while downplaying the loss in durability.