I think we got plenty of overt text in Resolutions and I think it worked well. It's like any office attraction where the parties are already involved with someone or where it's hugely inappropriate for some reason. You know it's there but you don't focus on it. With Janeway and Chakotay you had a much more intense environment with the isolation and need to work closely together all the time. They could have kept ramping up the tension but they chose not to. Instead they both have dalliances with others, even if they were not real. Was the door completely closed for Janeway before C went off with 7? Did Janeway think that perhaps if they got home she might have explored the possibility of a relationship with C? I don't know the answer to any of that, though I tend to see Janeway's shock at the husband word in Endgame as being more about losing 7 than Chak, though that's my personal preference for her.