Personally I think 3/16" is a perfect compromise thickness for a tough folder. Very tough for sure, especially with the steels and heat treat that Strider uses, but I've never had much of a problem cutting with that thickness, especially because they wisely make the blades very wide- they are thinned out reasonably near the edge and cut pretty well.
MY problem with ER's, in retrospect, is that at 1/4", and not very wide, and not thinned out much towards the edge, they don't make the best cutters and are "on the other side of the line" for me when it comes to general edc utility use. Don't get me wrong, they are nice and have their place, but aren't as useful on an everyday basis to me for doing things like cutting up cardboard boxes, etc.