I think this is true for computers that are in danger of being stolen. Laptops or PCs in dorms or other shared living spaces. But I live in a relatively secure area, burglaries are very rare and my PC never leaves the building. So the benefits of encryption are pretty much negligible.
The amazing thing is that there is often a translation layer involved and it still runs faster. And as it was pointed out, this can also be achieved with a “normal” Linux system.