Characters, to me, can be divdoied into three groups:
1) new characters (Rhonda Pineda - Atomica) These recent new characters are expected to be created to fit into a more diverse range of genders, sexualities, and races.
2) silver age characters (Ray Palmer - Atom) These characters were created in the fifties and sixties and came out of a SWM rubber stamp machine with an occasional woman. The situation with them is the sliding timeline where the JL and its members all started in the 21st century now. We don't believe a SWM and token white female team cast is acceptable anymore. hence, rewriting of history is needed.
3) golden age characters (Al Pratt - Atom) Same SWM machine as with the silver age, but also with occasional offensive language and caricatures. There are arguments that some diversity should be added, but most realize that a JSA that's as diverse as a 2010s team is too much of a stretch given the time period is fixed. A few other characters are introduced and nuances are added that weren't intended by the original authors.
There are challenges for every group of characters and the success of historical drama has shown us that we are capable of dealing with a time period where things were different but people were as strong and diverse regardless of their race, gender, or sexuality.