Whether he understands it or not, Twitter is in freefall.
User-facing Twitter is the last thing he should be concerned with right now, and mumbling about 4000 character posts or totally changing the stack is a complete waste of what time he has left.
First, he needs people who can keep the site running. The lack of a major outage so far is a credit to the former employees who built it. A few days outage would kill the site stone dead.
Second, he needs to reconnect with the advertisers. Last year advertising was $5B. After this, he’ll be lucky if it’s $2B, but probably less than that. Fortunately the people he needs to give advertisers the tools they need don’t have to be network experts, but they do have to understand advertisers.
Losing users isn’t good, but Twitter has always had a high churn-rate, and could recover if he can refrain from further stupid moves to accelerate the trend. Like, don’t piss off the journal… oh, too late. On the plus side, the people with huge follower trains are going to be reluctant to leave so long as it’s not a total Nazi hellscape.
If he continues to disown severance packages, I doubt he’ll be cutting much from the $6B costs after the legal fights are done. Add another $1B+ to service the debt. If the ad revenue is south of $2B, then it’ll be a good time to buy second-hand networking equipment.