Afaik, the result is generated by player seed + server seed + nonce... It doesn't matter how many times I changed seed but the same red streak never getting close to an end. It is kinda psychological rather than fairness, IMHO.
The importance of having a server seed that can be changed is to reveal the older server seed in order to use that to verify the bets placed before that instant.
That is the reason people are given the option to "rerandomize" the seeds. When you are betting the server seed is unknown - for obvious reasons otherwise you will be cheating the system. When you are done betting you can verify your bets to be fair by revealing the older server seed which was active all along.
It seems to me that many new players may not actually be knowing how to verify bets which is why they ask this question or have this idea that changing seeds means changing your chance of winning - its not so.