Phylex
PICK YOUR OWN
I've never really payed to much attention to hollow vs. solid stems until I too read about it somewhere. After looking to see out of curiosity, everything in my tent was hollow stemmed. Most of them are Sativa hybrids. But certainly not lanky. My guess would be inline with your theory. It's most likely due to lineage. But there's most likely a lot out there and it must be pretty common. My last 8 or 9 strains have all had hollow stems. I never even looked at anything before those to know.I believe its a lineage thing and I seem to see it in a lot of "lanky" sativa hybrid plants.
Lanky?