Presumably, my luck has just been lousy but can someone verify that bonus heroes are still working since supports came out?
Yes. They work still.
Ah, good. I’ll go shuffle my RNG. 
Havent seen any in a while. It happens
I went through a empty patch but saw one again the other day
3* bonus heroes are working very fine for me. But 4* bonus heroes… I have not seen any in the past 2 or 3 months.
I got a 4* bonus hero the other day. I remember it well because I was excited when I saw the gold flash, disappointed then it was an Eddie Brock cover, then excited again when I got a bonus Chavez cover.
Smugness alert - I’ve had 2 5* BHs in the last 5 days.
Had that happen to me in the very beginning of BH and then my high expectations were slowly eroded as I didn’t get another 5* BH for 8 months…
I’ve had two since Jessica Jones entered latest, which is as many or more than I had in the entire time since they were introduced.
I pulled a JJ red cover and got a bonus 5* Thor (now champed!!) last week.