Riot Stormrazor looks way too similar to duskblade and could potentially buff AD assassins too much.

Assuming you can fit it into your build giving AD assassins access to a guaranteed crit does not look healthy from my point of view especially when it's only a 2.5 second wait time. It may be anecdotal but having an infinity edge in addition to standard lethality items and criting off of that 20% was the difference between me oneshotting people with little effort versus actually having to use all of my abilities. Sure it was some hard rng but the amount of damage it gave felt worth it because nothing else I could build would come close to that. A large part of what made rengar dumb was him being able to just leap out of nowhere with this explosive crit and melt you I would rather not see that being possible on everyone.

TL:DR I like that the changes are meant to make crit less RNG but for a class meant to not have crit able to now guarantee it is a massive shift in power.