[vaduz]

Speed of beamforming tracking is not the problem - what is a problem is the lack of compensation for movement of the base station (and necessary hardware for it) which is quite evident when people test it in motion [0] - which is quite understandable, SpaceX had to think about the features it actually needs to support to get current price point and use in motion is not the intended target for the current rollout. Tracking is much easier if you can assume that the ground station is immobile.

And no, putting it in a passive gimbal as some of the other commenters are suggesting is not enough to fix this as the direction of the antenna beam is not even close to being parallel to ground (like it is when a gimbal is used with a marine radar).

Plus there is the fact that it does not appear to be sufficiently waterproofed to begin with and the motor mount is rather flimsy (both a problem if you want to use it at sea instead of lakes...).

Marine antennas for Starlink will come, no doubt - but the current home user terminal one is not it.

[0] https://www.youtube.com/watch?v=cU2y-QmQfXY