I mean, the 90's Recto's are THE sound, and largely what appeared on most albums. and there is a huge demand for this circuit, so it makes sense for Mesa to offer it.
It's strange for me though, because I always associate Mesa with being a forward looking company. It's not like them to appease people like this, before they'd make a totally new amp rather than reissuing an older one. Maybe it was a fault of Mesa before that they couldn't realise when they got something as good as it can possibly get before you lose some magic. IIC+ and 2 Channel Rectifiers captured peoples imaginations more than other amps from those lines.