Uh - i would say both categories are evenly ok. As the extracted materials and products are used in industry and the process itself is of course extraction first.
As of the setup: you can safely delete most of the things if you are not happy with the links. The only exception here is of course the command centre as it mainly decides where your view is going to be locked when you open PP.
Dont forget the extra costs you will have to pay when you delete things as you will pay again when you place new ones in different locations. That is one reason why you basically never ‘submit’ anything aside from the command centre when you build your planetary setup. Try moving stuff around until you are happy with the link length etc and first then begin ‘submitting’ thus fixing things in position.
Bear in mind that planetary resources will deplete and respawn elsewhere. Your “perfect” setup likely won’t last more than a week. You can chase resources around the planet or you can accept reduced harvest for a while until the resources you need respawn close to your colony.
Correct. If you are serious about PI you need to join corporation that has access to null sec and 3% POCO tax, otherwise u are not making much. Resources on planet is abotu 5 times more than high sec.
Resource deplete overtime and I destroy everything to reach new hot spots 2 or 3 times per month. It’s really a penny comparing with how much I make in null sec tho.