Movement speed is too valuable on Trynd right now.
I prefer the old days when I could just rush infinity edge on Tryndamere and crit some fools with huge juicy chunks of damage.
You can't really do that anymore. Its all about speed now, and it detracts from Tryndamere's "feel" as a champion. Trynd isn't supposed to be the guy that runs at you really fast and attacks you really fast, he's supposed to be the guy that lumbers towards you and smashes you with big slow ponderous crits that do so much damage per attack it makes people say "what the fucking hell?"
I really tried to make the big-crit style Tryndamere work this season, in hundreds of games. It just isn't working anymore, even situationally.
I win far more games by doing a heavy movespeed build, namely:

Tryndamere is strong with this sort of speed, and it feels good on its own grounds, but it doesn't really feel like Tryndamere anymore. As a long time Tryndamere main, I'd prefer a slower harder hitting Trynd, even if he were a little bit weaker overall as a result.