Why is it too late? Ramm I know you really want your mods and think without them being implemented ASAP the game is pretty much done and dusted but it's too early to give up completely in my opinion in certain features being added. It is still relatively early in PC's life cycle (Elite D was released a couple of years earlier and is still receiving updates). Hopefully once Jurassic World is released more focus will be given to Planet Coaster as they won't have any completely new titles to work on (that we know of [wacky]). Weather would be a big thing to implement and they haven't ruled it out completely. This talk of Planet Coaster 2 is a little premature I'd say given it would be years (if at all) before we would ever see that.
Of course I would love both mods and weather. But I think it's too late because this has been suggested since 2015 and to actually still add this after all this time (without it raining inside) is gonna be difficult for the engine since we're already at the limits. Maybe by mods I would love that but I don't expect it from Frontier since they said no multiple times.