Taking your comment in good faith: A lot more engineering goes into "make people click on ads" than you seem to be realizing. And like or not but monetization is at the core of Twitter's business.
If you meant my comment, I have nothing but respect for all engineers and developers. What I meant by not hitting the ground running is that Tesla engineers and developers would not have any of the tribal knowledge from within Twitter and if they were already let go it may be incredibly difficult for any person to reverse engineer things.
I'm talking in aggregates, of course I don't assume that because it would be totally illogical.
I'll be explicit in my assumption. If it were actually possible to rank engineers in some measure of productivity/effectiveness, the median at Twitter would be more product/effective than the median at Tesla. This gap would widen if we are talking about productivity/effectiveness at tasks necessary for Twitter's business.
I've met lots of MIT and Stanford students (can't say the same for Miami).
I've also met lots of Big Ten students, and UT Austin / Duke / Utah / U. Washington /SUNY students. We can compare one to the other in terms of analyzing & fixing software and I'll take that bet anytime.