My observations:
1. If you want to run fast, you need to run lots. You can reach your potential without ever lifting. Sprinters have won 100m world championships without lifting. Gymnasts never lift and perform ridiculous feats of explosive strength.
2. Lifting can help certain athletes. Especially long term runners with injury history and without a background in non-endurance sports. Some athletes might really benefit from putting on 2-5 lbs of muscle especially if they are very skinny. Improves power to weight ratio.
3. Gaining muscle while running lots is one of the hardest things to do. If you are running lots and add even 1 lb of leg muscle, you should be commended.
4. Single leg deadlifts are better than two legged deadlifts. Training single leg coordination under load has helped me. I'd rather have good control of my hips than move lots of load.
5. Sprinting is very anabolic done right. No strength exercise is better for runners than sprinting. 8 seconds hill sprints followed by 2-3 mins rest is pretty similar to a deadlift set IMO in terms of anabolic load.
6. Deadlift trains a weird type of strength. Never in running do you grind under two-legged tension for six seconds. running is an explosive single leg sport.
7. Most runners lift too hard. Lifting to failure is really hard on the body and top olympic lifters almost never lift to failure. Most high level lifting is "easy" and doesn't create days of soreness. lifting to 95% of failure is ideal for runners because it saves your body for running. Check your ego though....you aren't gonna be moving much weight.
8. Bounding is also a great strength/coordination workout.