Floors for Rooms That Changed Jobs
A room being converted usually has a bare or painted slab under it, and that slab is the cheapest finished floor available if it is treated properly. A home gym needs a surface that takes dropped weight and wipes clean. An office or studio needs one that does not shed dust onto everything at ankle height. A converted bay needs both, plus a finish that does not still read as a garage when the door is shut.
Bare concrete is the problem in all three cases rather than the room. It is porous, so it holds dust and releases it, absorbs anything spilled on it, and cannot really be cleaned, only swept. Coating it closes the surface. Dust has nothing to come from, spills sit on top until they are wiped, and the floor can be mopped like any other finished surface. If you want to go deeper, here is what each coat in an epoxy floor actually does.