You can *still* take insightful reflexes. Even without evasion you will still be making most saves and taking 1/2 damage-enough to zerg through most traps to your hearts desire.
AND, you get wail at 17, as opposed to 19...that is the biggest issue for me for TRs. Guildies of mine often go 19wiz/1rogue-enough for traps but still getting wail at 18, the level you farm vale, reavers, amrath, etc and are raiding. Getting it at 19 is not acceptable because many TRs are level19 for a matter of minutes.