@lewm Presumably you are talking about the Booplinth? You ask some great questions, why no bracing etc.,
There have been a number of aftermarket plinth makers, some involving all metal plinths, various wood combo’s etc., none of these have been that successful from a SQ perspective.
Also, there is certainly a premium attached to a plinth that comes from Linn themselves, even if they are re-badging the product. I suspect that Linn did not want a bamboo plinth, as they would be in direct competition with the Booplinth, and they knew that they needed to exceed the ability of that product. Apparently, this has been accomplished with the new Bedrok...at a price!