The primary reason to delay the blowback recoil operation of a firearm isn't to absorb recoil energy for the comfort of the user. At the moment of firing, the pressures inside the cartridge - and thus inside the chamber - are extreme, more than enough to split the cartridge wall and throw metal in whatever direction. The pressure rapidly drops as the bullet accelerates down the barrel (increasing the volume in which the majority of the gasses are trapped) and eventually the bullet leaves the muzzle, at which point the pressure drops dramatically.
The delayed blowback action is used when a firearm has a powerful enough cartridge that two things are true: one, the chamber must be kept mostly closed until the pressure has dropped far enough to permit the safe extraction of the empty cartridge and two, the recoil impulse is powerful enough that simple mass and spring tension isn't enough to perform this delay; some form of mechanical disadvantage must be used to further 'block' the chamber closed for long enough.