24Ghz frequency isn't very much great. after reading some articles and posts on UBNT forum, it appears that 24Ghz frequency is very vulnerable to signal disruption. a little rain could disrupt the signal
This is a funciton of the physics of the link, not the actual equipment. At the unlicensed 24 GHz, you are limited by things like Tx Power allowed in your region, rain fade, fog, sandstorms, etc. You need to have proper backup links in place for these events. However, the capacity in combination with the cleaner spectrum make it very desirable for <5 mi links with absolute clear LOS.
I have one 24 GHz link in deployment (~2.1 mi) and it hasn't dropped yet, and it moves around 655 Mb/s of data full duplex with ~2ms latency at full load. Our other 24 GHz link is ~4.5 mi and we are still testing it so I can't comment on longer distances.
10 GHz and 17 GHz would be better for range, but most of the time anything that you need long distance, high gauranteed capacity and low latency requires the use of licensed equipment so you can get past low allowed Tx Power, and EIRP limits.
For example the AirFiber you were reading about has a TX power of 0, a Tx Antenna gain of 33 dB, and and a Rx Antenna gain of 39 dB.
I personally really like the RouterOS platform, but Mikrotik needs to make sure they don't jump onto the wrong bandwagon. Stay in the market you understand, can compete in, and make money in. There are already tons of names building reliable PtP links at the frequencies mentioned, not sure if Mikrotik would be able to compete and still make money.