Did you ever wonder why do you need custom fields in your webstore? It's only time wasting, your employee will be adding fields like dimension, colour, type etc. rather than entering everything in the description. But is it really a waste of time?
Did you ever wonder how much time would you spend in webstore, in which you have to visit each product to find for example size? Probably not much, unless it will be rare product and will be available only in this one online shop. Do you agree?