In that case it might best for T1s to follow the rule of small numbers -
Small carb = small insulin, less hypo / hyper
Do you agree?
Limiting carbs certainly works for some, and I'm happy for them, each to their own.
But I think the "rule of small numbers" can lead to unnecessarily restricted eating options, so I don't agree that it is a required aspect of managing T1 safely.
Higher carbs and higher insulin does not inevitably lead to rollercoasters. Failure to properly understand how insulin works does.
These discussions often happen without putting them in context. What sort of numbers are we talking about here? A lot of my meals need about 9 units. Is that regarded as too high an amount? I really don't feel I'm putting myself at risk with that.
One point which is often missed in these discussions is that although the insulin amount might be high, there's a broad correspondence (provided the carb count and ic ratios are ok!) with the carbs on board, so if a mistake has been made or some random T1 unpredictability appears, the consequences are usually little more than a couple of biscuits will sort out. While it's not a lot of fun having a hypo, or dragging a hyper back into range, we're not talking about life threatening situations here (I am conscious in saying that that being seriously out of range for extended periods is damaging, but in the present context, we're talking about random short term flyers), so these are risks worth running.
Cgm is becoming more widely available, mainly through self-funding, and, fingers crossed, eventually through nhs funding, although I'm not holding my breath on that. I think cgm makes a major difference to the small numbers question. Simply being able to see bg moving in more or less real time and proactively responding to it means that many of the perceived risks of not small numbers disappear.