Why only 2 tries on Odyssey?

We had a PvE event before,on Star Guardians event you had 3 tries PER LEVEL,but for some reason you have 2 tries throughout the entire campaign? Why is that? I know you people at Riot want to shove down our throats that you need friends to complete the missions,but guess what,I don't have friends,no one and I don't think this is uncommon for people that has their main hobby as gaming.
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