You will find disagreement only if you deliberately choose words like "brittle". The word you want is "simple". Crypto protocols need to be simple, to reduce at

You will find disagreement only if you deliberately choose words like "brittle". The word you want is "simple". Crypto protocols need to be simple, to reduce attack surfaces. "Flexible" protocols are the ones that are actually "brittle" -this is where the use of metaphorical language breaks down. "Flexibility" actually just introduces more places to break. It is by now well accepted that modern crypto protocols should, in fact, be simple, and you will NOT find much disagreement with this.