The developers have commented on this feedback in their Reddit AMA ("ask me anything").
"This is something we've investigated, but because this touches our save file architecture there are no plans at this time to increase the limit." (Source)
I don't know how their save system works, but I do find it odd that they seemingly can't increase it on consoles when the limit is higher on PC, and a player was able to mod the PC version to increase the limit.
I do hope they change their minds since there's a high demand for this, and they did say "at this time."
I really hope so. I was really upset to have to delete my first character. They really didn't pay attention to how a lot of us play or keep characters on this one 😭
