It would if they didn't have sufficient compute, RAM, ROM. Something that can buffer and edit 2 lines (~160 byte, and not necessarily 8-bit ones either) does n

It would if they didn't have sufficient compute, RAM, ROM. Something that can buffer and edit 2 lines (~160 byte, and not necessarily 8-bit ones either) does not necessarily want to add hundreds of kilobytes of dictionary and the code to look things up in it.