That is a beauty. I too love bamboo as a plant and all the things you can do with it. I have watched a house being formed from start to finish with it over three days, everything from roofing to flooring and partitions. Truly amazing material.
I am also a reserved Carbon 'fan'. I use it but I am very cautious about it, especially forks, bars and seatposts.
I have used a Carbon stem, but would not be happy long term relying on one for the sake of a few grammes.
Just my suspicious nature.
I always advise against it when I am asked what frame material to go for, and people are generally happy when the Alu full susser they end up with is massively better specced yet only a fraction heavier. Most people who ask me are less knowledgeable, and I rightly assume they would not look after the bike well enough to make it worthwhile.
I think matters are somewhat different for someone like yourself Pat, as I am guessing your experience and awareness would come into play judging how much, over time, impacts and wear and tear might have effected your steed.
After all, some people will drive a car around with a cracked chassis without ever thinking about what damage might have been done hitting a speed bump at seventy. Those who know what effect that might have had would have it checked out.
Most 'Carbon' mountain bikes have other materials in areas that are difficult to lay up, and those are usually the most stressed areas like bottom brackets, etc.
My personal experience suggests a hybrid of materials, each applied to capitalise their strengths, makes a great bike.
So why not have it all?
