Any wood is susceptible to failure or checking. That's just the nature of wood. Grain structure, layout in the bow, moisture of the wood, and sealing can all be perfect, yet the wood is still subject to failure. I suspect bowyers do all they can to minimize the chances of problems, but in the end, we're still dealing with a somewhat unstable natural material that is put together by imperfect people.
Sixby and I visited about the use of gaboon in the bow he's finishing up for me. We decided to use the phenolic I beam in the riser for strength and the gaboon to contrast the cocobolo in both the riser and belly lams. He went to a lot of work to stabilize and seal it. I have no qualms whatsoever about it's use in my bow...even though it is mostly cosmetic and not so much stress, or load-bearing.
Here’s some pics from the riser glue-up.