Barton Gellman defended auto-updates, arguing they do more good than harm
Firstly, he doesn't offer an argument, you quote a tweet, which is an assertion. It's his point of view,
Secondly, if there are any statistics on this, let's see 'em.
There may be users who for whatever reason don't mind a bit of downtime, but people who own their computers, and want to do, you know, work, might want to choose when or whether to update