I'm not sure Respawn has considered the actual psychology behind why it should exist.
- Getting carried by botters is toxic.
- It's toxic to actual pros getting weighted down by regulars.
- I'd rather have a zero percent win rate in a true ranked solo mode than taking my turn getting carried to wins by cheaters. SSBM devolves into lower tier players having their MMR red-lining to specific values, then getting it brought up by matchmaking with cheater stacks.
- Some of us are tired of stacks that play it as a duo and ignore you anyways, so you're playing it solo anyhow.
- Some of us are also fed up at times dealing with other people, and would rather just vibe purely solo.
Yes, the gameplay and character kits are geared towards a team based shooter, but they can be retweaked specifically for a solos mode.