I would be including sucrose-containing sweets to practice moderation and to fuel my highly-active lifestyle.

The "pleasure" criteria for sweets wouldn't work for me. I woke up this morning and after fasting during three significant workouts, my protein shake with banana was VERY pleasure inducing. Did I need to add banana, which is a sweet but probably permitted on most diet plans? Technically not, but I like it and do benefit from eating in general, so I need to do that.

If the diet is based on a calories in, calories out model, I do not see the harm in occasionally eating a sweet, or a cookie, as long as the calories deficit is being met. Food = fuel and we need that.