I have a Terra Nova Bothy 2 - ignore the “2”, it’s really a one-person bothy, one man and his (small) dog if you’re lucky. It’s small enough and light enough (370g) that I don’t resent including it in my crowded rucksack, so I carry it probably more than half the year.
I’ve never had an emergency needing to use it nor have I operated inside it but have used it as a wrap-around-me wind break a few times in adverse weather where there was no shelter at the summit.
I’m in a similar (maybe worse) situation [i.e. old (70), need more protection than in my youth (<55)]. Checking the Wx forecast I’ll take extra layers if need be - I don’t always judge this right.
I’ve done a ‘mock’ activation at home pretending to operate the radio from inside my bothy bag and it’s unpleasant and not what I walk up mountains to do, Frankly, if weather conditions are that bad, I would rather do a quick activation (maybe only 2m with a HT) and get off the summit.
For me, a bothy bag is strictly for emergencies.