Like you say, there are no source of data or evidence that wifi improves odds.
From just personal experience...
I've never had wifi on, and get the updates on par when stuff is rolling out to others posting on this forum.
When you're on Tesla's schedule, you'll get it. Probably right then Tesla tests for car being connected on wifi, and if so comes down that way, otherwise comes down 3G/LTE. That's the opportunistic test right then and there.
From just personal experience...
I've never had wifi on, and get the updates on par when stuff is rolling out to others posting on this forum.
When you're on Tesla's schedule, you'll get it. Probably right then Tesla tests for car being connected on wifi, and if so comes down that way, otherwise comes down 3G/LTE. That's the opportunistic test right then and there.