folder are inferior to tag, period.

If you want "folder" in GMail juste use one tag.

But you can be more flexible with multi-tag

my 2 cent

they just have been integrated into the main chip

by 486 era if I remember correctly.

By that time they had enough transistor to just put everything inside the same silicon chip, faster, cheaper.

Today, every CPU have an IEEE floating point unit.
To say we don't have maths co-proc is misleading.