Just saying if you are getting access to the app on TestFlight then you are part of a very very small testing group, more like Alpha than any big rollout. So maybe there's only about 100 of you. That's the standard maximum for a small developer using an AdHoc rollout. They may have a larger set of phones they can access on an in-house deployment certificate that you may be part of.

But either way you are on the cutting edge.

Source (me, developing using TestFlight).