This is true. The WM bags are cut slim. I'm 6 feet even, and broad shouldered and I like the WM bags but others of similar size find them too tight.
When backpacking, decisions are based on comfort. Should I carry that full length mattress that weighs a pound and a half? Or go with the 4 ounce torso foamie? What can I deal with in terms of comfort? Those are questions every hiker should ask themselves making gear decisions.
There should be a reason behind shedding those ounces. This is something that I think gets lost on this forum. Most folks here are gear weight obsessed without thinking about why. If you need to get down under 10 lbs. base weight to alleviate a knee injury, or because your not 30 years old anymore, or because you need to carry an additional 5 ounces of food a day to squeeze in the energy to hike that additional 5 miles, then fine. Those are reasons. But I think a lot of the time, gear weight control is just a numbers exercise. We fret over slashing a half-dozen ounces off of our base pack weight when there is minimal, if any, gain realized.
A few years ago (ok, more than a few) I got back into backpacking after a long hiatus. The last time I had hiked a trail, I was probably carrying fifty pounds on my back. I knew I wanted to carry less so that I'd enjoy my hike more and BPL was a huge help. But for the type of trips I was taking, when my base load was down to under ten pounds or so (waaaaaaaay too much weight for a lot of folks here) I found that every ounce I continued to shave wasn't translating into difference on the trail. I had spent a good chunk of change to discover that.
Be comfortable definitely and cut weight but do keep your eye on the dollars.