The problem isn't the SMS "protocol", but that operators still haven't been able to find an amicable solution to regulating sender names/numbers that doesn't in

The problem isn't the SMS "protocol", but that operators still haven't been able to find an amicable solution to regulating sender names/numbers that doesn't interfer with legitimate usage, e.g. commercial businesses doing EBR texting to their customers. The problem isn't entirely comparable to that of caller ID spoofing for phone calls, and is legally and technically more complicated than you imagine.