Let's look at a simple analysis of why it's actually a good idea to have more than exactly 2500 RS.
For a good comparison with which I am very familiar, and therefore feel qualified to comment, we'll use Agent vs. Enforcer. Now, I'm not talking about who would win in a fight, but the usefulness of a certain tool: snare perks.
My agent has 2500 RS with GSF (Neutral >.<).
Your typical Enf has what? 3000? 4000? 5000? I've seen some 5ks thrown around here, but I'll go with a nice 4000 RS which is dead in the middle.
Tranquilizer used with Assassin 10 trained debuffs
1200 RS.
Soften Up debuffs
600 RS.
That's a grand total of 1800 RS debuffed. Worth noting, Tranq checks 100% AS vs 80% Evade Close. It's not that easy to land on Enfs without an AR setup wearing a scope. Let's suppose it lands though.
4000-1800=2200 RS remaining. The enf is barely slowed down at all.
Assuming Tranq misses (which it does often enough), the Enf is not slowed down at all.
So yes, you may be soft-capped at 2500 RS, but the more you have the less you feel the effect of snares. Given 5k RS with rage procs, I'm assuming, means Enfs are barely slowed down by snares at all. Even top Fixer snares.