What is Lumon actually trying to do? Cold Harbor is apparently about fully getting rid of past emotions when severed… But isn’t that how severance worked in the first place??

I would say, that their environment is sooo aseptic at the severance level this is an indication that it doesn’t work as well as they would have expected. This explain this strange work environment where emotions of innies are controlled by bizarre mechanisms. I would say this Cold Harbor thing is a way for Lumon to really have a more reliable severance effect. And people will be able to be severed externally.

Also the fact that the Egon father goes to see his innie daughter and appears to prefer her innie might indicates he would like to replace his outie daughter by her innie at some point. Also an indication IMO that Lumon expect to severe people externally.

And regarding the amount of revelation we had during this season was satisfying to me. We already learned a lot while still keeping a lot of things confusing. We learned about the origin of Lumon, the cult of Kier and how they take children to work for them.