Sheeple, quit using CV and Flash, they no longer make that much a difference. In the meantime, I can stomp on people because I have the better summoners. Hehehe~
Flash is mandatory on cow. CV has been a deciding factor in almost all of the recent games I've where there was at least one. I have no idea what you're trying to say here.
I think that nowadays Cow, as most champions, is far better off with Ghost for initiation purposes and everything. You lose out on flashcow, but Ghost is far better at covering distance and generally anything positioning related that goes on for more than two seconds. He's got Headbutt as well to cover distance, and really, if Cow comes at you with Shurelya's and Ghost popped, your escape prospects are quite slim. You'll tend to have more escapees but hell, if people escape teamfights they might as well be dead.
Please also note the eight flashes in the game. I think that at least half of them are force of habit and really no longer required or even the optimal choice. Fizz would be far better off with Ghost/Surge IMO, Cho could lay off Flash for just about any other spell - Ghost comes to mind, but others could work as well. Irelia's Flash is silly and should be a Ghost. Graves and Ashe could both exchange Flash for Ghost as well, it depends on the amount of CC mostly. Perhaps even a Cleanse. Ashe's kiting certainly is a lot better with Ghost.
Fids and Morg can make an argument for Flash because of their ults. Flashcow can be a similar reasoning. But I would try to use another spell on Ali first, perhaps it comes in more handy overall.
CV is still a good spell. But it might need reevaluation whether it's still absolutely required. Usually I only have two to three "man, CV would be handy now" moments per match, and at least one of them could be avoided by me being more vigilant at warding baron. The covering application has been worsened a lot by uptime dropping to six seconds.
Heal is kind of on probation. It's a bonus tankiness package that's useful for Leona particularily later on, and helps your lanemate in early. Until now it hasn't blown me away, so I might switch back to Exhaust/CV Leona. Exhaust's simply too good on her.
tldr: I was drastic in my statement, but we need to talk about Flash and CV, and their remaining usefulness. Not everyone needs the Blink.