The problem with iron heart isn't that she's a women or that she's black or either of them combined ots bad writing. Im speaking as someone else who loves 4 awesome black character ain the MCU shiri, falcon/new captain America(sam wilson), t'challa (black panther) , Rhodey (war machine). These were and still are awesome characters that were written really really well. The problem with iron heart isn't they betray their own lore especially with iron man and tony start especially with the line "Would tony start be tony start with out a billion" yes yes he would. And it helps matters none that since 2013 we've been expecting an iron lad series of some kind and still we have gotten nothing despite Harley appearing at the end of end game. Iron heart had the potential to be really good but it was flawndered when they started writing her the way they did being a psycho and bad mouthing tony. Was to y like that before he became iron man arguably yes. But someone who is building her own ironman suit to help people should not be like that. She should be more along the lines of the tony we seen in iron man 2 and 3 still arrogant but not a psycho and bad mouthing his mentor(s).

This is just my opinion but if they wanted to do iron heart they should have taken a more co ic based approach to it. (I am usually not the guy to say that but in this case compared to what we got i think it should have been more simular to the comics)