I don't believe I claimed Twitter was not under active development. The point that I was making here is that if we were OK with Twitter as-is, it would be possible to maintain it with far fewer people than they employ now. Indeed, 'maintenance' will be defined differently for an indie hacker vs. a popular website with user-generated content. But all software has some split of "keeping the lights on" vs. innovating.

What is your estimate of Twitter's effort split between those two categories?

You're moving the goalposts to a hypothetical situation where anyone is OK with Twitter as-is.

No one is. Twitter cannot be "as-is" because it would be overrun by bots and bugs.

Exactly. Any one who has ever worked in SaaS industry realizes how many cogs in a wheel it takes to keep it running. Sure, there are always inefficiencies and redundancies. But, I highly doubt Elon figured out in a week that 50% of employees are not necessary. This looks like the vindictive and impulsive action of a man baby who has never been told that he doesn't always know what's best. Time will surely tell. All the best to those who were laid off, but most importantly, good luck to those who are staying back. They are in for a ride.