The rifles that Marvin Pearson is building out in WA are decidedly muzzle heavy and he's building them at a prodigious rate for the people in the northwest.
Keith Cairns, however, has a somewhat different take on the idea:
He feels that muzzle heavy rifles hold somewhat better....until you begin to tire a bit. Then you start fighting the rifle and everything goes south -- especially toward the close of larger tournaments.
His equipment balances forward, but not radically so.
(I've noticed that the ISSF types seem to be trending the same way.)
Hard to argue with Keith's track record...
I'd suspect that the Liljas are 21" because they're designed for the stool shooters.