Yet they are still around and not obsolete.

Excepting niche cases (like filling out carbons in triplicate at car dealerships and such) typewriters are pretty anachronistic. It is, however, amusing that over the past decade as things have digitized fewer people seem to own printers. Without a printer a computer fails at the simple task that a typewriter is inherently designed for - putting words to paper. Anecdotally <50% of my friends have a printer in their home... I wonder how that compares to typewriter ownership 50 years ago?

Regardless it's pretty clear that the author of the site is a big typewriter fan hence their statement. I find it contrived, but hey, it takes all kinds to make the world go 'round.

The article pointed out one glaring problem, one that was present with the Apple II (along with other microcomputers of the era): it could only display uppercase text. It got around that by displaying capital letters in inverse. A related problem was the limited display width. While a typed page is roughly 80 characters wide, the Apple II could only display 40 characters per line. Thankfully the Apple II was expandable. 80 column cards and cards that displayed lowercase text were created, but Apple didn't introduce such capabilities themselves until the Apple IIe. Even then you needed to buy their 80 column card (but at least that standardized things).

Another hitch was actually typing lowercase letters. You needed to do a shift-key modification for applications to register the shift-key being pressed when a letter was typed. Again, Apple didn't standardize this until the Apple IIe.

Of course, those weren't the only issues. Computerization may have been taking over the world, but so were reams of paper. While most of those additional reams of paper were being generated by computers, much of that paperwork existed before. Forms, in particular, almost necessitated the use of a typewriter. While I would hate to line up forms in a typewriter, such feats were nearly impossible with printers.

So I guess you're right in some circumstances: computers were not a good experience. That doesn't negate the times when they offered a far better experience. Whether you're writing memos or novels, the ability to go back and edit text outweighs the drawbacks (never mind all of the advancements that were just around the corner). But a blanket ban on typewriters was myopic.