Just did the trip (N to S) in July. I know this reply is post Labor day but just returned from a 2 week trip in Alaska so I missed the post.
WCT is one tough trail. Heading N to S the first 50 K (out of 75) are fairly reasonable. Lots of beach walking, ladders, cable cars, mud and scenary. Those 50 K put you 1/2 way through the rigors of the trail and could be hiked by an experienced lightweight hiker in trail runners etc. (probably only get sucked off your feet 3 or 4 times over the 50 K.
The last 25 K (N to S) are a different animal. Mud holes the size of footballfields, marsh crossings on collapsing wooden boardwalks, 65 degree clay bank climbs using ropes to pull yourself up, 300 ft Sitka Spruce roots that rise 3 ft. mid trail, a mile of beach boulders the size of VW's covered with seaweed and green algae, ladders, ladders, ladders, surge pool leaping, tide poolo skirting, 7 ft mid trail waterfalls requiring class 3 climbing tech., and a couple hundred thousand wet rocks to make sure the footing is NEVER flat or evenly placed. I guess it could be done in trail runners, but WHY?
I left for the 6 days with 29 lbs on my back and a pair of Montrail Stratos on my feet. A light waterproof ankle supportive boot was just the ticket. I feel only once on the trail (group average 3.6 falls) and that was in the last KM. One commenter noticed the look of folks on the posted journals. Notice, and copy, the gaiters on everyone. Hell, without mine I may have never been able to find my feet on some days.
By the way, the WCT was a great trip. With the big blowdown last fall visitor use has plummeted and there are far fewer users then in past years. The trail crews that work the trail (First Peoples crew members) have done an absolutely unbelievable job in clearing or rerouting the trip by 2000 BIG downfalls.