>What fundamentally does twitter do? Sell ads by moving data around using enormous first mover advantage of account numbers. And that needs a huge employee count why exactly? I am not asking that it did, or it did in the early days of the technology, or what the competitors do.
The issue with this question is that you make big assumptions to how the work should be. Sure to you and I maybe it takes 1 person to unscrew a lightbulb, but that's given our assumptions about the nature of the lightbulb and the whole job and where it takes place.
Maybe twitter built themselves such a lightbulb that its 50 feet up high, and now you need to hire two people to change the lightbulb, one up on the ladder 50 feet up and one on the bottom. Maybe sometimes the latter falls, and historically the ladder holder doesn't want to admit liability. Now you need a third witness to make sure the ladder holder isn't murdering the light bulb changer (seems contrived but e.g. jobs working with children are like this where you need two adults in the room)l. If the light bulb is made from hazardous materials maybe you need a safety officer signing off on your process so insurance companies actually cover you for the high risk of murder in this line of work. Now we are at four people to change the lightbulb and you'd be a fool to remove any of them based on all the context I've given. Oh and you need to fill these positions for three shifts, so twelve people on payroll to ensure you are covered for lightbulbs around the clock.
Its easy to add fat to a process, sometimes its very justified fat, and hard to cut it out after the fact without damaging a lot of other things you might not be accounting for at first glance. Thats why people are giving Musk a huge side eye here, because he couldn't have possibly accounted for everything already. Most people who make sweeping changes to orgs successfully start off by taking a lot of time to study how the org works, and not changing much of anything that would taint your observational study before its concluded.