u/PinkyLine

Honestly, one of the most tilting experience, when you playing as adc is when your support legit griefing you (legit grief or just playing extremely passive), making thus you pretty much quite useless (pray on your abilitiy to farm even). But because they are support and playing champ that has ability to impact by design (5 man bubble from 0 30 nami and from 6 2 4 nami is functionaly the same), they end up deflecting the blame on anything bad in the game on you. And if you win - support will receive some praise, while you not (despite maintaining good cs, not feeding, participating in fights as much as you can and dealing as much possible damage as you can from that position). Geniunely, this is hardest possible source of tilt that this game brings and it is really hard to fight it. But it worth to resist it in the end.

Well, title. Leona is actually terrible support for Samira (in current meta). First of all, generally, enchanters are currently better than engage supports. Second, Leona, unlike other engage sups, is much more harder to follow up for Samira. Thresh pulls champions to him, Pyke pulls champs, Naut pulls champs, but not Leona. Which means, that there are many cases, where even your passive cant make it up for distance, that you need to go, making disconnect between engage and follow up. Third, Leona deals basically 0 damage in comparison to other sups. She is tanky, yes. But you need to make up for her lack of damage. Finally, more ranty and anecdotal, but majority of Leonas are terrible. They cant find engage window ever, they cant threat your enemy at all, they waste all spells