Rain Ruins the race

I'm genuinely curious why there has always appeared to be reluctance from CM to add the option to disable wet weather in career modes. In the past I did enjoy racing the AI in the rain and wouldn't have used this option, but I would have appreciated it being there as a choice. This year I would probably have rain disabled at present - I'm not enjoying the grip disparity to the AI, and as a cockpit cam driver, the latest forced on-screen water drip animation bugs the crap out of me. 

But just some thoughts on it:

-  Each of the tracks already seem to have a basic rain probability coded in to them. You are less likely to get rain in the Middle East races for example, so there has to be a value attached in the programming for each track somewhere - surely there could be an option inserted which just tweaks that value to 0 for all tracks when the option is activated in the career mode setup menu?

- In the past there were 'tools' which could be used that removed wet weather in career just by a value change in the game memory. The morality of that sort of modding is not the point here, but the point is that the game still functioned and rain was gone, so it was not something baked in to the core functionality that couldn't be touched without breaking the game. 

- Surely it can't be a licensing thing. I understand the official tracks only, limited damage model etc, that's all part of what FOM will allow and it is what it is. But surely FOM don't demand rain has to be in the game, it has nothing to do with the F1 brand marketing (ignoring the FIA's real-life reluctance to race in rain anyway...).

- Is it the devs responsible for putting work in to the rain elements being upset that people will just turn it off? Rain was already quietly dropped as an option in Time Trial a while ago.