You'd need an excessively powerful transmitter to use an omnidirectional antenna. In the context of a satellite, where power efficiency is crucial, it makes much more sense to use a lower-power transmitter and a directional antenna / beamforming.

Hmmm... but less precision is still required than optical lasers, right?

A bit? It doesn't really change the nature of the problem, just the tolerances. It's nowhere near the intractable problem that some people make it out to be.

I mean, we are all aware each extra 9 of precision/uptime/etc. is far more expensive than the last. If the lasers require an order of magnitude more precision (and I could imagine it being higher), it would be a far far harder problem.