Shield supply beams have already been nerfed (they only give the mothership the "under fire" recharge rate. Test it yourself if you don't believe me.
And perhaps I should clarify:
Why are EMP weapons useless? They have to work against a ship's own regen, so in order to drain the power of a ship with 1 mil e/sec, you need to have 150,000 power drain blocks just to counteract the regen, let alone drain the storage.
Why are shield drain beams useless? The same reason as power drain, and Ion weapons already to this job but 100 times better and at 10 times the range or more
Why is push pulse useless? Because it has utterly terrible range and effect compared to, say, a damage beam with a push pulse effect
There's also the fact that none of these beam weapons can be used by AI to consider.
The only one of these beam weapons that has any real use is the power supply beam.
@MrFURB
If the weapons are so great as you say, then why does nobody use them?
So you're saying that these weapons are useless because people are too lazy to build interiors?
Top Kek
They're useless because they're useless.
Also there is space for ships in a fleet with different viable roles, but flying around with shield/powerdrain beams is not one of them