Supers, and mealworms are extremely easy to keep in stock like you mentioned. They are so cheap it doesn't make sense not to buy a thousand or 2 at a time usually. So that takes care of 2.
If you are breeding dubia roaches, that takes care of 3. Though I wouldn't really consider breeding them a task. They are pretty self sufficient as long as you provide them food and water.
BSFL can be bought in bulk and stored in a mini fridge set to the proper temp, or just at room temp. I have more dragons than the average person here probably, but still, I can order 2k BSFL and they last me easily a month, without me having to do any work. So there is 4 options right off the bat that require basically no work.
Hornworms, I usually add on to my order if I'm buying any type of bug. And I typically do an order once a month or so for things. They require no care what so ever either. So thats an easy 5.
So there is 5 different feeders right there that all basically require no extra work on your end, besides adding them to your cart online.
You could also buy crickets in bulk and keep them, but this takes more effort than the 5 I mentioned up above, so i'm not considering them a super reasonable insect to keep.
Silkworms also can be "farmed" by simply buying eggs in bulk and hatching yourself. Also, more involved than the other 5 but still doable.
Point is,it really isn't difficult to have multiple feeders on hand. I would be doing literally the same amount of insect work with 2 bugs from that list as I'm doing with 5 bugs right now. It obviously gets tougher if you only have 1 dragon or your dragon isn't eating as many feeders anymore.
Not that I'm saying if you don't offer a variety you're doing it wrong, I just think people don't realize how easy it is to have multiple feeder options available.
And here is the kicker, there is absolutely no negative to providing such a variety, only benefits. So if you can make it happen, you should. And based on how easy it is to keep and store most of our feeder insect options, it doesn't hurt to try.
-Brandon