For a competitive player saying anything like you don't have to use the slider to maximize your worlds is like telling a race-car driver to not use the turbocharge in his engine... 
I mostly play with tons of self imposed regulation in most 4x games rather than giving the AI more bonuses, currently I need to gimp my own hand and give the AI bonuses so it can keep up.
Also.. it is NOT more efficient to use industry as soon as you get to 300% from a mathematical perspective it is more complicated than that. If you never build a single manufacturing plant on a world and you want to calculate how many and at what level those plants have to be in order to gain more than you loose is not as simple. It also depends on so many other factors... such as you overall strategy and urgency in this particular moment.
The same is true for upgrading infrastructure on planets which often are a waste of resources as long as you are settling new worlds. It can for example take more than 100 turns for a research world to break even on an upgrade from tier one to tier two buildings when you look at the gain and cost benefit and that is not taking increased maintenance into account either. So... efficiency are many times not to upgrade planets but just settle new ones until you can't expand anymore. Money are generally only useful for covering the maintenance fee and to some extent buying improvements.
The Projects will be changed in the upcoming patch so that part should be fixed. It obviously don't fix the overall problem with terrain bonuses generally being ignored once you understand the game mechanic.
To be honest I don't understand why you design a game with bonuses that in general are for the most part pointless after you realize how the game works. It is also very easy to change this whole thing by one very simple fix... remove the focusing wheel for individual worlds... now colony management actually becomes an interesting game of multiple choice. The slider only add micromanagement and one dimensional colony planning.
No one is forcing anyone to play the game to win and go through all the tedium necessary to reap all the benefit, but should you really have to?!?
There is a simple solution to the problem...