I agree, I'm assuming their engineering teams are the biggest in size like my company which is of a very comparable size with legal, hr, ops and business counterparts.
But coming to Twitter engineering teams, what are they doing actually? their primary technical product is tweet timelines and trends, their mobile apps are kind of okay, the user experience hasn't changed much except getting slower and slower. If all they do is rewrites, they are simply wasting the talent.
There could be SRE, Security, Datacenter admins running 24x7 but other than that, I see no useful idea out of them in a long long while. See instagram, snapchat and others for example, they've explored the unknown and brought us some quite good and plenty bad social media. Twitter at least should've been masters in content moderation by now, but they're far from it.
For an outsider they seem to have lost their way and are being a couch potato munching on the junk food.
Now consider sales, content moderation, HR, lawyers.
Now multiply that by multiple countries that need servicing.