When it comes to EDC, yes. Weight is a consideration. Most of my EDC is on my key chain. It's got pliers, a couple screwdrivers, a pry tool, a micro light, a p38 can opener, a small 58mm SAK, and a few other things.Is the weight of your EDC gear a big consideration?
That's a lot of stuff to weigh down the ignition on a vehicle. That's why I have it all on an S shaped carabiner. My keys can be quickly detached from one side of the carabiner so that the full weight of everything isn't dangling from the ignition while I'm driving.
When it comes to the rest of my EDC consideration, it's mostly down to bulk. I don't want my pockets bulging out. Whatever I carry needs to be small and thin. It's that simple.