Yes, this is a common complaint. I really don’t know why Zebra never upgraded the Sharbo X to have a retracted detent. They did introduce it in the Surari model, though. I posted about it HERE.
But I agree, the Sharbo X series is a very nicely done multi-pen design. Personally, I’m perfectly happy with 3 inserts. But you can get 4 in the TS10. It’s a heavier multi-pen. And it’s tragically much more expensive. In any case, I’ve heard feedback on it and not as good as with the Sharbo X LT3 / ST3 series.
I like the Surari, but it’s not as attractive to me as the Sharbo X. Its advantages are being a little thinner, a metal end cap, and the detent for retracted. But that “bullet” shaped nose cone is not as appealing to me as conical. I also don’t like the fact that chrome furniture has no alternative. There’s no matte silver / gray / black options.