Sharkbait you theory sounds good but is flawed and this is why
http://www.mastersweep.com/OPT.HTM
about 1/3rd down
http://www.dawlishstoves.co.uk/
“the wood is burned much hotter than in an open fire”
If you have a modern wood burner it usees secondary combustion of released wood gas which is why they are more efficent.
Yes more heat is retained in the stove and there is substantial less airflow up the chimney but it is at a higher temp and a liner is helpfull in ensuring the effux exits the top before it cools down too much amonst other things, Twinwall is the expert I just did lots of research before we fitted ours