Nope. There is no legitimate reason to restrict USA ham radio to a 300 symbol per second limit on HF data/texting. It was simply an old blue law left over from the late 20th century. The 300 baud rule is part of the antiquated Technology Jail of ye olde FCC rules. Another blue law in ham radio's Technology Jail: Content-based HF sub-band assignments. The Technology Jail only applies to USA. Other countries don't have this Technology Jail. The story goes... back in the 1980s, as packet radio was first taking off, some ARRL codgers got together in a smoky back room. They wanted less of that "new-fangled computer stuff" around the HF ham bands. So, they talked FCC into hobbling data throughput, in an attempt to stem the growth of HF digital technology. Their plan actually worked for a while. For 30 years, it has kept USA back in the digital stone age, while other countries developed advanced HF technology.