I hate when champion reworks turn into overhauls...
I see a lot of players who are terrified that one of their favorite champions will end up on the rework chopping block. I really hate it when the Riot developers go needlessly overboard in champion reworks. Sometimes a champion will have one or two problematic/outdated/boring abilities that could use tweaking (Poppy's old Passive + W+ R, Sion's old Q + E + AP Scalings, Yorick's Passive + E, Taric's E + R, etc.). But then this champion gets handed off to some overly ambitious developer with no respect for the champion's established playerbase who goes...
"Hmmm... I could just fix what's broken and leave this existing champion intact, but I got all these great ideas I want to use. Hardly anyone plays this champion we've deliberately kept dumpstered for years, so I'll delete their entire kit/role/identity and try out some shiny new ideas I've been saving. Maybe I'll even finally get to test my crazy, immobile, melee, bot-lane bruiser experiment...
"
NO! Be conservative with reworks. Respect the champion's established playerbase. The reworks should be designed to appeal foremost to the players who already like the champions, not to random people who will play the champion for 1 week after the rework then go back to whatever is the flavor of the month anyways. Alienating a longterm existing playerbase to mildly amuse an unattached crowd won't create lasting value.
If a champion has a broken mechanic that necessitates it being kept weak, replace just that mechanic. Don't go overboard and remove unique, balanced, fun, interesting mechanics like Yorick ultimate just for the sake of change. If the kit is boring (completely subjective by the way) then add complexity without subtracting from the core concepts of the original kit.
Shen's rework was quite decent because his kit/identity/team-role survived the changes due to his dash taunt and global reposition ult remaining unchanged. Less is more when it comes to reworks. Fewer unneeded changes = fewer alienated players.
Save your experiments for developing brand new champions, not at the expense of deleting something that already exists.