I will, with rare exceptions, not trade comfort/convenience/effectiveness for weight. For example, on solo backpacking trips I regularly use a 6-man tipi rather than one of my lightweight tents or tarps. Why? I have made a subjective decision that the comfort and convenience is worth it to me. Ultralight is a subjective term for every individual, in my opinion. As objectively as I can state it, I would say that an ultralight setup is a setup that is as light as one can go without sacrificing effectiveness and utility.
More realistically stated, the above is what I tell myself to make myself feel better and to enable me to convince myself that my sacrifice was not stupid for any given regret.
