Although I agree with you that a lot of people here don't understand science, and that there is a lack on analytical thinking... I don't agree with the reason you stopped posting here.
I also read a lot of BS, but I do try (although it sometimes feels like fighting a loosing battle) to explain things over and over again.
Especially BroScience is hard to get rid off, and some people are on this forum 24/7 to spread their nonsense.
For example the whole discussion about 'you have to keep your res cold, because cold water holds more DO'. In itself it is true, but it is irrelevant.
Or 'roots need a lower temperature, because in nature it is always cold under the surface of the soil.' Right, there are no plants growing in Africa or SE Asia, where 80 - 85 degrees 3 feet under the surface are no exception.
About root rot that 'it can not happen with lower temperatures'. Root rot (and us amateurs can hardly tell one from the other) can have different causes. Even a cold environment can cause a disease (Phytophthora). Another one, Rhizoctonia Solani thrives the best at 60-65 degrees. Thielaviiopsis Basicolaome grows well at temperatures of 77-83 degrees but can infect the plants more easily at temperatures of 59 -65 degrees.
So keeping your reservoir cold can cause problems as well.
Root rot does no occur exclusively in hydro-systems. Also in other systems. In greenhouses they use Rockwool slabs. Temperatures of 70-75-80 inside those slabs are no exceptions. Do they have more root rot because these slabs are warm? Nope.
So
@Aqua Man Please don't stop posting here on this forum.