Yes, I really do the mastering of the songs using the Wave editor, for the convenience of work.
This is really the template, in which there are also loaded viewers and listening simulations, not just processing effects. As I use a step mastering method, of those 25 plugins I use about 13 or 14 (most subtly, a matter of color and details), but it depends on the project. For that reason and due to the agility of the work, it is convenient for me to have the template with the plugins that I usually use, to have them at the click of a mouse.
It is no longer a matter of number of slots, if there are many or few, it is more a matter of putting limitations were there could’t be, only that.