The term "shaker" generically applied to what is just a normal Frame and Panel design. They are not really the same thing. Frame and Panel doors, as far as modern use, are made with thin (approx 1/4" or 6mm) sheet goods. Most are MDF or Ply, depending upon final finish.
True "Shaker" door were of course solid wood and actually a raised panel design. The panel was reversed to appear flat on the outside, which was the preferred "plain" look. The raised part of the panel was turned to the inside, sticking into the space some. Often the panels were the same thickness as the doors, so they would stick in by the same amount as the in-set of the front. All of the ones I have ever seen have had a much steeper angle, because it was not intended to be decorative. It was just there to thin the panel on the edges to fit in the groove.
In reality this was a technique to keep doors flat, similar to bread-board ends on table tops. The frame would stay straight and on-size, while the floating panel could move without in being noticeable.
The exterior "look" is the same, but thin panels are not Shaker.
All that said, slab doors are easier to keep clean in a shop. Dust doesn't catch on the ledge, which I also why I generally edgeband and finish plywood doors in a shop space too.
But, as mentioned above, I gives you an opportunity to get some practice or even just show-off a bit. Why not have a nice space? Just because it's a "shop", doesn't have to mean bare-bones.