So does Linux (although by default it only seeds it after initial boot, so doesn't help with boot-time seeding), but the problem is that the seed must be truste

So does Linux (although by default it only seeds it after initial boot, so doesn't help with boot-time seeding), but the problem is that the seed must be trusted. Which may be true (or true enough) in a number of specific cases, but it's not true in general.