Disagree here. In fact, i've recently built a passenger Dolphin and as a passenger ship - there's rly a lot unused energy available. Wake scanners are rly big power dump, so that's first time i saw a real possibility to fit a B class without making sacrifices (ok, got to downgrade Fuel scoop to B, but that's too little). And went to a famine system distribution center. Build smth and then use it for smth else, feels nice.
And i can say it works well. Ships are coming by 3-4, you sit at one place (if scanner engi'd for range, that's important, otherwise it gets tedius to fly those 2 kms), and by the time you scan those 3 wakes new ships usually appear. I wasn't rly counting G5s, but by the time i had my G1 full i'd estimate i had like a dozen of them + quite a number of G2 to G4. I've uptraded or exchanged extras and returned for some more scans. All sounds like a clueless farm, but idk, even if so it felt quite fast. I used to install less powerful wake scanners on my Planetary Ops ships (if PP was ok) in hopes that, well, maybe i would scan wakes sometimes - but no, you only scan very rarely when you remember and ain't lazy. So either a dedicated wake scanner ship, which sounds an overkill for me, either such hauler / passenger vehicle seem to be a good way.
Mm it's discussed later. Mb something got broken/nerfed/changed at some point. But my Dolphin story is recent, like from last week.