Achros and apois borh have their niche in astro. Andd there are excellent examples of both, and less than excellent too...
As for manufacturers changing their designs, not going to happen. Their first thought will be that the public will think their original design is somehow flawed, and worse still that they have done something wrong. It's like painting a scope & mount black - sure looks sleek, but it cools so far below ambient temperature that black surfaces form dew before everything else, and frost when the ambient temp is just above zero°. White painted scopes and mounts don't behave the same way. And try telling the manufacturers they stuffed up!!!
You wouldn't believe how much surface colour affects the thermal behaviour of items. I've seen the black light shroud of big dobs soaked and with dew pouring of the bottom them them, onto mirrors and screwing up mounts and electronics, but any exposed light coloured timber parts bearly wet with dew!
For this reason, DON'T USE BLACK CORFLUTE!! Use only white.