Change the promo algorithm and remove promo series between regular divisions

Title.

I've played a LOT over several accounts on both NA and EUW. In every single promo series, it's like Riot intentionally makes the games as hard to win as possible. I remember failing my Silver 2 promos two times as a D3 mid / support, simply because I queued for support and couldn't out-carry the blatant inting players that I was matched with. How is giving someone players have 9 losses in a row, going 2/11 in mid AND top, fair in a snowball meta?

Change the algorithm that exists in promos so that promo games can feel fair. At the very least, allow 1 or 2 free dodges in promo series. Why do people insist on picking garbage team compositions when someone is in promo series? I remember getting a teamcomp with 4 ADCs (Twitch jungle Corki mid Vayne top Lucian adc) and me as support while the enemy picked Malphite, Yasuo, Jarvan IV, Nami, Caitlyn. I couldn't dodge the obvious loss (we got steamrolled) because I was in promo, but it could have been avoided with a better-designed system. Conversely an enemy adc was in promo, and his team composition was absolute trash and my team steamrolled his.

Change demotion between divisions so that you can't demote without having 3 losses in a row at 0 LP. I shouldn't be winning an extremely hard promo series, win one game, lose the next 3 and bam demoted again to where I have to win the next 4 in a row to promote (in Plat+). Stop matching promo players with obvious smurfs with 86% winrate on Kassadin, or 67% on Neeko with only 40 games played.

Because I know nobody will actually listen and remove promos between regular divisions which is the best option.