I think Apple II development continued while Macintosh development was going on, so, not really
The Apple II paid all the bills at Apple and got neglected. Then there was the Apple III which ... was a POS because Steve Jobs decreed it must have no fans and it tended to stop working quite often. A "fix" to reseat all the chips pulling out of their sockets due to the heat was literally to lift the computer up off the desk by a few inches and drop it to reseat the chips (not a joke).
Then there was the Lisa, it did not go well.
Then there was the Mac.
During all this time, the Apple II is still paying the bills and generating profit at Apple, because VisiCalc was the first spreadsheet, and it created a compelling business-use case for Apple.
The Mac finally took off because of what you see is what you get display and "desktop publishing."
If you want to laugh really hard or be amazed, take a look at Windows before Windows '95 (which was terrible, but they finally managed to somewhat clone a Mac-like GUI), and compare it to a Mac, and then compare both of them to a NeXT which looks like a computer and OS broadcasting from 10 years in the future (or 20 for Windows 3.1).
Anyway, over here in 2022, MacOS still has all the NX_ NeXT keybindings, which I find hilarious.
Steve Jobs was phenomenal at being a great artist. Because great artists steal, to cop a line from somebody or another ;-) and he was brilliant at seeing half-assed implementations of various technologies and then significantly improving and marketing them. The problem being, back then the actual tech wasn't yet good enough to satisfy his demands/needs so you wound up with terrible products that didn't work due to arbitrary Steve Jobs imposed constraints (Apple III), or was too expensive for normal people to buy (Lisa, NeXT).
What any of this has to do with twitter, IDK. Twitter was always a piece of c--p post dumb 140 character tweets system which never made any money in its entire history and has been an albatross in anybody's portfolio dumb enough to buy it. Elon Musk is a businessman, not humanity's savior. Twitter has always been people buying or bullying their way into controlling a global narrative. The single thing twitter has going for it was being in the right place at the right time and getting hordes of people to pile into it.
Having said all that, Elon's job isn't to make the world a better place, our government, which is supposed to represent us, should be doing that on our behalf in our country, I won't bother to veer off into that tangent, but Elon should just purchase the US government, and do same as he's doing to twitter, but I guess the Rothschild's don't want to sell, because their Ponzi scheme is doing significantly better than FTX, and it's unlikely he's the richest person on Earth; just the richest whose wealth 3rd party metrics can measure and quantify.
In conclusion re: twitter - who cares. Just my humble opinion, along with laughing at the chaos. A bit off topic, but this entire thread is off-topic and has really 0 to do with Apple anything.