Seeing your abs is primarily about having a low enough body fat percentage. In other words, if there is a layer of fat over the abs, you won't see them.
When you bulk to add muscle mass, you will gain fat as well. For example, when you gain 30lbs on starting strength, anywhere form 10-20 of those pounds could be fat, depending on genetics, diet, sleep, etc. If that fat ends up on top of your abs, then you won't see them as well. On the other hand, you might look significantly better in the end due to the 10-20lbs of muscle added to your body. Moreover, after you finish the bulk, you can do a cut to lose some of the extra fat while retaining most of the newly gained muscle.