You are correct - with a full broadcast the base color will be completely hidden from view - so it would negate the need to be concerned about the base color, but it doesn't negate the need for the base coating all together!
The flakes need something to attach to, they're not adhesive by themselves, so if you just broadcast them on a bare floor, and coat over them, they would simply lift up like a rug. Plus a good base coat does more than provide an anchor for flakes. A quality base coat provides shock and impact absorption. When an object, be it a tool, or whatever, falls and hits bare concrete it chip the concrete. Those divots are dirt magnets, they make it harder to roll around tool carts, they chip out easier, and they just make the floor look nasty. The correct base coat absorbs impacts, because it remains somewhat flexible it acts as a sort of trampoline, and by preventing some of that kinetic energy from transmitting to the substrate it helps avoid those divots from being formed. It's important to have the correct epoxy for the job. There are some that are very hard, but just like glass is extremely hard they can also be a bit brittle, so they are also prone to crack or chip out easily.
And you can use just clear, even with flakes. We've had a couple of jobs where they liked the look of concrete so they just used our clear BondTite 1101, our high performance primer. There was one job where the specs called for about 5 layers of Bondtite with the three middle layers each having a different mix of DecoFlakes - they wanted a deep, 3D look for the finished floor.
There are a lot of different things that can be done with flakes - you just need to keep in mind the pot life of the coating, and plan accordingly.
I would not even think of having flakes without some sort of protective clear coat like EnduraShield 2254- if you can't get a clear coat - don't use chips.
There are also many different types and special flakes, metalized, glow in dark, etc. We've been sending out a lot more of the holographic metallic looking ones lately. A small amount goes a long way - a large amount and you have a disco dance floor.
While a heavy coverage of DecoFlakes does add texture, it’s not the type of texture that adds a lot of traction. Our epoxy system has an extremely attractive high gloss finish, adding the optional SuperGrip 850 in the clear coat to provide traction and help prevent slips for those times when the floor gets wet, or when your wife, or you, are in 5" heels. I kid.