So RTTY isn't "real radio"?
de AA6YQ
Why don't you explain why FT8 has exploded as the mode of choice for DX & RTTY never did?
You ducked the "So RTTY isn't real radio" question, but I'll respond anyway.
RTTY
was the digital mode of choice until ~2000, when Peter G3PLX introduced a PC-hosted PSK31 application. PSK31 is narrow enough to enable panoramic reception, first exploited by Skip KH6TY in Digipan. Being able to tune to a band's PSK31 watering hole and quickly see the callsigns of the multiple stations QRV there was attractive to DXers and general operators - so much so that the ARRL extended (and renamed) its DXCC RTTY award to include PSK31 QSOs (and those in other less popular digital modes). PSK31's improved sensitivity over RTTY was also an attraction, but the use of lengthy macros in PSK31 QSOs dramatically reduced the QSO rate, causing DXpeditions to avoid it.
FT8 is also narrow enough to enable panoramic reception, and is significantly more sensitive than RTTY, PSK31, CW, and SSB - to the point where ops with limited HF antennas can work the world with FT8. There are no time-consuming macros in FT8, so DXpeditions can and do achieve good QSO rates in FT8. While it does not support interactive QSOs, FT8 is an excellent replacement for the perfunctory "599 tu" QSOs used in DXing and contesting - hence its explosive adoption. Ops seeking interactive QSOs can gain some of FT8's benefits by using JS8.