Thresh should be melee, he could be better in so many ways!!!
Thresh being ranged really makes me feel sour as a thresh main. Right now you wanna build coin into moby boots into knights vow... problems- Thresh doesn't want coin, he wants relic and you know it. More tankiness means thresh can feel better about not exploding cause you took a hook to get a pick. Thresh gets a fraction the benefit of knights vow EVEN though he is a tank by all merits and has a kit to facilitate going in and doing some mass crowd control.
If thresh were melee he would get the following buffs with no other changes... Relic route- Twice as much healing from from consuming procs, execute dmg, better lane pushing power. Knights Vow- twice as much healing from ally dmg and twice as much protection to allies.
Not good enough for you??? Well consider that going from ranged to melee warrants other changes for thresh. Thresh has one of the lowest if not the lowest base ad/ad scaling in the game. They did this to him because of his e passive, they dont want him pokeing adcs any more harshly then he already does. However if he cant just walk up and single auto people at range then what would be the reason to keep his ad low huh? The same goes for his attack speed, he has some of the worst in the game again do to the passive only its the on hit dmg this time. Melee thresh could again have a better base value and better scaleing. Over all the autos on thresh could be made so much better just from being made melee. This also would allow him to have better base tankiness stats both in regard to his base amor and his magic resist scaleing.
I know what you are thinking... but then you miss out on utilizing his e passive effectively without needing to all in.
Well what they should do is put his e passive on his q. That's way you don't need to chose between leveling them up for one or the other. His q is also a far more effective zoning tool then his e passive can ever be. To be able to utilize it effectively at range what they ought to do is make it so rather then being on hit with autos it should instead be added onto DEATH SENTANCE dmg. Yeah you lose the on hit but overall the combo dmg will happen faster cause it happens on q rather then on needing to do his slow motion auto. To make this big dmg not broken riot can make its flat charge longer(like 15-20 seconds) which isn't that big a deal since it no longer applies to his autos. However to make up for this a new addition would be nice where if he reactivates q to dash to a target then the charge time is nonexistent and ready for the next q with minimum cd currently being 3 seconds. Not really that broken considering all a player must do is dodge or be helped by their team. This also means thresh's infinite scaling would be more relevant relative to that of nasus and veigar.
This is also a benefit cause you're thresh, your autos don't matter for your team. You are a support, you focus on using your abilities to help your team.
Laslty the ability is called DEATH SENTANCE… don't you want most of your dmg on DEATH SENTANCE? Take it out of the box ult dmg if you gotta, I play thresh for DEATH SENTANCE.