harbor doesnt need changes imo, he has a good niche as a controller, its just very hard to use and, as you argued with yoru, most pro teams will never exploit him that well.
Agree with the chamber change, his trip being non global is just annoying as fuck and is a big nerf on maps where he could be good (abyss)
sage and deadlock can be good in pro play because they heavily counter the flood retake style that is used a lot on certain maps (haven or lotus).
For example, its so so hard to retake b site lotus or a site haven when the enemy team has a deadlock or a sage (if they cycle their util well).
Problem is, its hard to make it fit in a comp, as it doesnt really have a ton of synergy with other agents, except with raze, which only makes this idea really viable on lotus imo (could be hot take).
And even then, i dont think this comp is better than the meta one with viper, but could work IF you lean heavy on b site (as the viper comp usually tries to allocate as little resources as possible to B), which is unfortunately mega readable.
This is why the FUT comp with a sage and no init was working in EMEA in split 1, it can take opponents by surprise.
I think its mostly useful in a gimmick way tho, as an alternative to the default comp, and considering how hard it can be to play it, im not sure its worth the time.
Clove will probably never get reworked for pro play and i think its good, they are a ranked agent, made for ranked, not pro play.
Agree with the iso change, maybe change some numbers but thats a decent idea.
L breach change tho, its only easy to dodge if you know where its coming from, if it takes you by surprise it can be hard as fuck to dodge
L jett change, jett is fine
Reyna has a niche in pro play (just look at paper rex), and phoenix too with 6 orb ult (he would be played a lot more if pearl was in rotation).
Also im not sure phoenix is played that much in ranked ? might be just my experience tho.
already talked about sage but also her wall can make retakes on sites where there is a post plant meta (b on abyss or b on sunset) a lot easier, and teams can work with that. Sliggy says this might be really good on abyss, i have doubts but who knows.
deadlock is really fucking good in ranked tho, you should try it shes really fun
also w take on yoru, should probably be a 8 orb ult, his ult is top 3 best ults in the game with iso ult and sova ult imo. idk why the fuck he has a 7 orb ult.
(me when i get baited)