Yeah. A single gap, has to be sliced in a toroid, and leaves it weak. You might not be able to wind wire over it, and it might break just from clamping in the winding machine. If the gap is filled with resin, that's extra steps. Two gaps, you've just got any old two-piece shape core, except you can't use a bobbin (well, you could slide the pieces into it this time, actually). And you've got all the disadvantage of the gap's fringing field, and the wasted volume of the bobbin if applicable.
But it does mean distributed-gap materials are ideal, and indeed, we have a huge diversity of those in toroids!
Tim