Yeah I know, I don't have a hot bar button for my mod yet. Just saying. I appreciate it being available in 0.17 already :)
I'm definitely not talking about 100% ground coverage. I'm talking about (1) Placing fewest poles so all (relevant entities) get power from the closest network while (2) placing poles at a fairly regular grid close to the supplied entities if possible so it doesn't look like complete garbage.
Basically, do my job at wiring up a factory after I've placed assemblers and inserters etc. With the lamp placer tool I can do a filtered deconstruction of all lamps in my factory and then use the lamp placer to plonk them back again in similar enough spots as where they were before. A pole placing tool would do the same for poles, place poles so that my factory gets electricity without me having to place the poles down manually no matter what the factory looks like. A blueprint can't do that unless I want a power pole on every single tile...
And the poles would preferably be close to the assemblers/other crafting buildings so they aren't taking up space where you will likely place other buildings. But if it's a planner then you can just make the planning area not cover space where you don't want poles in most cases anyways so it's not a big deal.
Roboports and radars would be placed at a regular grid though.
Lamps are placed in the electric grid, and the poles would be placed so they touch all the things with the network. If the tool places both then it should, of course, do lamps after poles (and no lamps would then be placed where there are no buildings and no poles already.
Hope that clears up what I was thinking of.