It is strange, and I've been experimenting with it.
Silent Browns are entirely possible: witness Gateron Silent Browns and Aliaz.
I've been trying to make a decent silent light tactile, and the Silent Sky stems come closest. They're about as tactile as a Clear, and you can run them at low weights.
So I'm looking into 60 G Silent Sky stems in MX Clear housings, lubed with 3204. This ends up being a little heavier and more tactile than MX Brown. But if lubed correctly, they are smooth enough and return well on the upstroke at 60 G.
They are mushy in the bottom-out and are not as crisp as a non-silent tactile, but they are light and they are quieter.
I wonder what challenges Cherry would face in creating Silent Browns. The rubber bumpers would cause some mushiness and shuffling, but that didn't stop them with their silent linears. I think it's because a Silent Brown might require a little more power to operate properly, given the dampening materials, and they want to keep using the same stem and spring.
Kailh BOX Silent Brown is a decent concept, although they had some manufacturing issues. Spontaneous disassembly in the early batches, and BOX switches have always had trouble with some of the stems being rotated. I found that the BOX Silent Browns almost felt like Zilent V2. They're a more tactile adaptation of the BOX Brown. But the travel is limited: BOX Browns have 3.6mm, and I suspect that the silent variant is less than that. 3.6 mm is good, but I don't like less than that in MX switches.
If you liked the BOX Silent Browns but they weren't up to snuff, you might try Zilent V2. They tend to be built better, but they will be more tactile. The only thing Zilents really need are lubing of the springs, or better-yet replacing the springs with something good. Some people lube the switches themselves. They are most compatible with Cherry-profile and KAT. [Works well with OEM for me.]