Yeah, everybody goes "640K OUGHT TO BE ENOUGH FOR ANYBODY, LOL." But if you're designing (say) a custom in-house protocol for transmitting telemetry, then "what

Yeah, everybody goes "640K OUGHT TO BE ENOUGH FOR ANYBODY, LOL." But if you're designing (say) a custom in-house protocol for transmitting telemetry, then "what happens in 20 years when someone tries use it for bulk data transfer for some reason" really shouldn't be higher on your list of priorities than "what happens when it receives literally any data besides what it was expecting." Hypothetical future expandability is good to consider, but not as important as present-day intended use.