I thought Riot fixed primary roles even if you pick supp secondary
For a while it was working well, but then I got supp in 7 of my last 10 games. I can handle like 20-30% (maybe even 40 or 50) but 70% is not cool when it is my secondary. Even if it is support and no one wants to play that role. You're punishing people who play support as a role and turning them into supp mains.