Gate Construction
We now have an objective that explains, in-game, how to use minerals and approach gate construction. The Wiki gives a lot of explanation on how gate construction might be influenced. The forums are full of complaints about auto-selling leading to "bad gates".
I've looked everywhere I could think of and have never found any discussion of why we would want or need to influence gate construction.
What makes a "good" gate versus a "bad" gate? Are there gate combinations that do or do not lead to certain bosses or to the core? Are there difficult-to-complete strata that drop rarer materials? Or is this simply a really convoluted system for players to promote the level types they find more fun?
I'm happy to contribute to making "favourable" gates by skipping the auto-sell function but I'd like to see some discussion of what the benefit of doing so would be, either to myself or to the community.
Thanks!

To answer your question about bosses, the Developers choose a stratum in a new gate that is predetermined to be boss levels. They do this so at any one point in time there is always a gate with each boss in it. At this point there are only two bosses so our mineral deposits don't make a difference. Perhaps when there are multiple bosses for each tier, our mineral deposits will determine which boss we face.
Also, personally I might want to see more undead strata as I have equipment that allows me to demolish all undead mobs.
And I have seen people saying that certain minerals are more likely to produce certain types of levels (eg. arenas) but I don't believe there is any hard evidence for this.

srdclark,
If you make a lot of a specific strata, you may see a lot of specific drops from that strata. Materials are specific to certain monsters / strata. So are things like tokens.
Want to know why Primal Tokens are everywhere? Because there's a ton of beast levels everywhere.
hi im just new here so,
should we just randomly dump our minerals on any doors or aim for something?
I think people want variety in their gates, mostly. Or perhaps, say, someone really needs to collect a kind of material. If I want fine fabric, I'm going to really root for a Fiend level below the Moorcroft Manor point.
While the slime-all-the-time gates of days past annoyed me as well, I have a soft spot in my heart for slimes and would spring for a slime level before every clockworks terminal if I could.