Mastery ratings are counterintuitive for defensive supports
As it stands, playing a defensive support in a traditional sense doesnt score high enough in the right metrics to get a fitting mastery score.
I play a decent number of supports and I hit Mastery 7 with Zyra pretty easily. But as for my other supports like Nami and Lulu, its felt nearly impossible to get any Rank 7 tokens.
Statistically, I dont perform as well on Zyra as I do on defensive supports, yet I cant hit Mastery 7 with them.
On average with Zyra I'll have a 3.0 KDA with close to 50% Kill Participation and I will get an S every now and then.
When I play Lulu, I have had games with literally a 20+ KDA and over 60% Kill Participation and I dont get past an A+ for that.
As a support, my goal is to keep allies alive, control vision, and funnel as much gold as I can into the carries. This means that I am not focused on clearing creep waves and trying to do damage to the enemy team.
Despite that fact, I am only getting rewarded for games where, as a support, I take CS for myself and focusing more on doing damage, rather than enabling my allies.
That seems counterintuitive to me.