Why choose SMS today given it’s message length limitations? Also there’s the lack of security: SMS isn’t encrypted and can be sniffed. It’s expensive, while other modern messaging alternatives doesn’t charge by message.
Some pitfalls are reliability and lack of encryption and usually requiring a phone (which almost requires running non free today in practice, and having an entity knowing your position at all time and exposition to electromagnetic waves)
In France texts are usually unlimited in any offer, starting at 2€
Ubiquity.