Why put a plaster over the issue (carbs) when I can just remove the issue?
I think you might be over simplifying type 1 diabetic management by looking at carbs as "the issue".
Yesterday I had a hypo from walking, it wasn't a low low, over 3.5 so I thought I would experiment by treating with protein. I had 30g of cranberry Wensleydale and 25g bacon: 4g carbs15g fat 18g protein. It brought my blood sugar up,
unacceptable slowly, for a hypo treatment, to 5.5 plateau and then I got a delayed peak of 8.8 about 2.5hrs later. Obviously as I was experimenting with treating a hypo I didn't have any insulin with that. But if I was just having it as a snack starting off with normal blood sugar, I would need to use an extended bolus to cover it. Does that mean I should now think of protein as an issue to cover with a plaster? I'm not so sure that's a great way of looking at type 1 diabetic management long term.
My conclusion from my experiment is that protein isn't a good way for me to treat a hypo. It acts far too slowly. It is important to treat hypos quickly. And this certainly isn't an experiment I would suggest for a child where the priority should be getting blood sugar back up with fast acting glucose (dextrose tablets). I was just trying a thing and it's easy for me to try a thing with me, because im the only one im going to hurt if it doesn't work - luckily there was nothing hurt from trying, I was just hypo for longer than I would have liked, which is not good for maintaining (or recovering, for me) hypo awareness, and I was annoyed by the unexpected spike.
The list of things that won't affect blood sugar will be vanashingly small, I don't think any type 1 could live a full life and eliminate everything that does impact blood sugar. So my view is, why not manipulate insulin dose and timing (the most responsive way to manipulate insulin being via pump) to suit life? For me personally, "the issue" is I don't make any insulin and the best plaster I have for that is a pump. Although you can micro bolus with MDI and a half unit pen and look and where and when you are bolusing.
And, non diabetics also have spikes, so if the aim is to get normal/non diabetic blood sugar it might also be good to try and have a look at cgm traces for non diabetics who will spike, less dramatically, in response to food.