What I heard & experienced
When I bought my 2012 TE in August 2015, it was CPO with warranty... weather gets cold, the lower windshield heater isn't working because no heating element. So I took it back to the dealer for warranty service, no heat when I press the button. Service write up guy at first said it wasn't on the window sticker as an option, but I pointed out that it was *standard*, not an option, as I had downloaded & printed the 2012 brochure. So we looked at the windshield and he realized it wasn't Toyota glass. The used car manager agreed to replace the windshield under warranty (good for them!) and I got Toyota glass installed.
The parts guy said that the Toyota glass had some properties that kept the interior from overheating in summer sun, etc., just better. I don't know, maybe UV reflective? I recall reading thread(s) about OEM spec windshield glass.
But, my experience demonstrates that even though the heating element is standard on the 5th gen 4R (please chime in if that's wrong), some aftermarket glass doesn't bother with it, so you can lose out.
There are plenty of people with bad Safelite experiences, just as with dealer service. I don't know how to prove that Safelite glass is the same spec as Toyota. I've had Safelite do a couple of windshields on my full size Chevys
before I got the 4R, everything seemed fine with that.
Hope this doesn't make things worse for your thinking.