Honorary Blast From The Past Department: Smith-Corona.
In the 1980s, with the typewriter as we knew it being a machine whose days were numbered, Smith-Corona (like Brother and several others) began producing word processors, little automated typewriters that could store and retrieve documents, cheaper than a computer, cheaper by a yet larger margin than the necessary combo of computer + letter quality printer.
Smith-Corona’s offerings, the “PWP” series, did not suck. Early model had an external green text-based screen, a navigational keypad with up left right down arrows + a “menu” button + a “select” button, if I rcall correctly; a main “CPU-ish” body that contained the storage-and-retrieval and output the video to the screen, and a cable from that to the typewriter which served both as data-entry mechanism and as output-generator.
OK, here’s how they screwed over their early adopters again and again:
a) Version 1 used little cassette tapes for data storage.
b) Version II replaced the little cassette tape drives with 3.5" standard-issue floppy disks formatted to their own unique filing system. No method was provided for reading the old cassette tapes or transferring data from cassette tape to the new floppy system.
c) Version III got rid of the modular typewriter + “CPU” + keypad + monitor and instead came as an integrated typewriter/videoscreen with the standard typewriter keyboard as an external keyboard that would snap up into place across its front. The cursor and other keys formerly relegated to the external keypad were included on this keyboard. Oh, and storage was via a new 2" double-sided proprietary mini-diskette. No method was provided for reading the old 3.5" Smith-Corona diskettes or transferring from those to the new format. And certainly not for the yet-older cassette tapes.
d) Version IV was a lot like Version III, if I recall correctly, but it now came with a 3.5" standard-issue disk drive which could read DOS-formatted data disks as used by PCs. The word processing documents saved to these could not be read on the Version II Smith-Corona machines, which used the same physical disk type but used a proprietary Smith-Corona disk format, and of course vice versa. Nor was there any way to read from the double-sided 2" disks used in Version III, or from the old cassette tapes.
So every time you’d think of getting a new one, either to replace an old & dying one or just because you could find a use for yet another word processor, you had ZERO reason to stick with Smith-Corona instead of a competing system, because there was equal (i.e., 0) compatibility either way.