I believe if you read the news on the app they address this. They did some math changes to help make strikes more balanced for 2-6 players but unfortunately this math had unintentional and undesirable results with solo. They said that they are looking at this and as soon as they have an answer for solo and multi they will implement it. They didn't choose multi over solo, that's just how the math worked, and they are working on it. I am a solo player at only level 27 on my main. I wish the strikes were more friendly for me but I will give them some time to fix this because I believe they intend to. I may be wrong but only time will tell.