Just adding to this - Hardcore should be its own standalone preset, not through portal.
Portal is nice but it'll be 1000 different hardcore version rather than a de-facto hardcore preset that everyone is using, like in BF3 and BF4.
There needs to be some kind of standard, like it was, because the whole package is kind of essential.
Like the lower health, no regen, no minimap, that kind of thing.
I would suggest adding it as a official preset, then people can tinker on top of it in portal if they wish to, but a standardized Hardcode mode should be a thing.
For me personally, seeing as I only played HC in BF3 and BF4, it is basically what decides whether or not I purchase the game or not.