Leona-Thresh main, this is unplayable.
Riot- I know you try. But please accept my honest feedback. I know all the shiny graphics are all working, but the game feels very unplayable on my mains. I'm sure I'm not alone in thinking of leaving, (at least for a while)
To start off- a reminder: Leona and Thresh's playstyles (among others) are to exploit mistakes, or make clever engages, EARLY GAME- from level 2 onwards- . If there's no one to kill, we roam to ward or get other players fed.
Roaming: You removed assist EXP. I have had to frontline enemies, 3, 4, and 5 levels above me today. So now I can't roam and do teamwork stuff even if my adc is safe (I can but I get behind). This is hurting me the MOST. I'm good at it and I enjoy it. (it also doesn't give you comeback EXP when winning teamfights- damaging teamfight comps for a team game)
Runes: There are few suitable runes for engage tank supports. There's no early game health or armor, and the scaling healths start at 10+ minutes, (god forbid you roam with overgrowth, it's ~15). Additionally the heal based runes are useless for heavy CC type tanks: Even if you could proc them with relic, they'll be over same time as your CC, so your runes only work in the small window where you're not being attacked by the adc- Who, by the way, will mostly be attacking, from range, with their more easily activated and faster scaling runes, while yours are sitting behind conditions (aftershock requires an engage, for example). I'm sure this works for better toplane tanks who use spells in a trade. *Found the workaround but it still only procs during allins.
Peel + Shields VS Snowballed champions: Champions are now getting more than their 300 gold worth of stats when they get a kill, which helps them get another- and another, (and they've usually gotten the first from an early game lane advantage) you've done the equivalent of increasing kill gold, whilst handicapping my early game tanking and the effectiveness of my roam. I'm facing damage that kills my ADC faster, and I've found that building shield paths (FOTM, LOCKET) both fails to save my adc, and leaves me with low defences, so then I'm too dead to peel anybody.
All in all, the game feels like the Bloodmoon mode, except you've left all the champions active by accident. I hope my feedback among others can help fix things. I will try to apply patience to my mindset, but last year's preseason was a lot smoother than this.
(*Little edit: Found a red post about 'tanks will only be tanks if they build tank', which might give me a direction to approach my playstyle from, instead of locket + gargoyle builds)