Most playable characters have weapon selections and talents with very different play styles, similar to character classes. They can make characters more utility oriented or more crowd control oriented, more offensive or more defensive. This can be misleading in character selection, when another player picks a character that can be altered for healing or DPS or range, for instance: Alicia has a weapon that can heal allies, Sooma can equip a talent that makes her pain meter run out slower and she has a rare weapon that automatically replenishes her pain meter, with a build like that applying barriers to allies is ineffective.
I think the solution would be to have a loadout tag system in the character selection screen at the start of the match, that classified characters with their current loadouts for certain team roles. And once a players selects a character, a notification bar would highlight characters viable for the open team roles (based on the character and the variety of talents and weapon differences).
