Thanks for your detailed point of view.Not really... let me see if I can clarify it for you.
Functionally, the same thing as saying Rock is Rock is Rock or Wood is Wood is Wood. We all know this is not the case...
The weight has not changed compared to what? As I have explained, a Marco Rock today weighs more than it did when it was on a living reef because of Geologic processes that occurred while it was calcifying over the last couple of million years.
The *mined* rock you get is millions of years old and has not changed at all (except over the course of the millions of years it has been undergoing calcification).
This is where you've made the biggest mistake though. 90's live rock was not mined marco rock, it was harvested from a living reef, and as a result, never underwent the long period of dry calcification, silicization, and crystalization that the mined rocks went through.
This (Mined "live rock"):
Is not the same as this (Havested Live Rock):
There are more diffrences than just its geographic location (ie Where it came from).
I wasn't really going in depth as you have showed us.
I saw it as:
1 million mined rock bought 20 years ago is the same as 1,000,020 year old rock bought today. It's not lighter, it's not heavier, it's the same.
All done, moving on.