Nope, look at the newest and most accurate barrels being made today, some places to start are Accuracy International, Barrett, and even PWS's MK3,
you will learn that heavy for the sake of heavy is long gone, todays ultra accurate sniper rifle barrels are thick where they need to be to support the
chamber and achieve the optimum stiffness but after that are fluted and streamlined in comparison to yesterdays bull barrels.
The Mk1 and MK2 barrels are among the best in the entire industry and are not pencil barrels by any means, they are very much contoured, it's also
worth noting that BCM and Daniel Defense are selling about 15-20 lightweight barrels for every one heavier govt profile barrel these days, lastly look at
the SCAR barrels, representing a purpose built design with operator input for the first time in small arms history and now with a proven service record
of amazing accuracy and durability.