I agree with you on that. But I have found Freestyle Libre has been really useful for this. I can see where I'm making mistakes more easily, like did I take enough insulin to cover my evening meal? which will always make it worse, or what's going on with the basal?
This morning I just had to correct by one unit, because it was just starting to hit 8 mmol/L, when it had been happy around 7 for ages. I can do that with Freestyle Libre, so that makes a massive difference.
Hopefully, at some point, everyone will have access to that sort of blood glucose monitoring.