The recoil lug controls all the recoil forces through the action. Unfortunately, it has been forgotten to a large degree.
By securing ALL sides of the lug, you control all forces - recoil, torque and flex - instead of it being transfered to the action screws where many mega dollar stocks put the forces. Very bad idea.
If the lug is not supported on all sides, the action will move towards the unsupported side. Overtime, that will cause wear and tear on other parts and on the bedding. Biggest problem is that it can cause flyers. Yes, a rifle will recoil in both directions- forward and aft. Not much forward but it is there.
On a braked rifle, the forward component is substantially higher.
If concerned that recoil forces only go back so why bother bedding the front, have a look at the fancy alum chassis tacky stocks and examine the action screw holes. You will find a nice imprint of the action screws ALL around the bedding screw hole even though the screw has quite a bit of room.
Yes, that action is moving around ALOT under recoil. Big reason for flyers and other PITA accuracy problems.
As to bedding under the rear tang, I do but in many stocks the amount of area there amounts to zip. It will not hurt to do it so I do when it makes sense. Supporting an action is never a bad idea.
Jerry
PS bedding the front of the lug and even under the first 1 to 2" of barrel becomes very important with a long heavy barrel. Gives the action alot of support to help with flex and flyers.