Early season I think parking will be important, since it’s an extra 30 points. Later season is where it gets more interesting.
The most crucial aspect of parking on your platform is that (barring some exceptions) you will be consuming space that would have accommodated a goal, and removing your robot’s ground abilities. If you leave mobile goals on the ground in the last 30 seconds, and you are trying to elevate your robot, chances are your opponents will have a decent shot at grabbing some of your mobile goals.
So assuming that you have a choice between elevating a goal or a robot, you choose robot, you have the potential to loose your mobile goal. Instead of scoring 40 points from an elevated goal, if you park and the opposing alliance steals the goal (in this scenario an alliance mogo), you get 30 points. If it is a neutral mogo that gets stolen, you get 10 points, or even -10 points if your opponent elevates it. If you manage to elevate a robot and keep the mogo in your zone, you’ll get 50 points. All of this versus a nice solid (almost unchangeable) 40 points from an elevated mogo.
Given the probable difficulties of keeping control of mobile goals, especially at the end of a match, I expect parking to only gain traction with robots that can park while holding several goals. I anticipate some popularity with these types of robots, giving me hope that we may not have a super strong-meta this season.
I think that at Worlds, teams will start trying to get those 50 points from an elevated robot and a mogo in your zone. Perhaps making use of the platform to hide mogos around or under it, further complicating efforts to steal them.
TL;DR Probably don’t park.