Well, the same argument applies to 1/72/25mm as far as using 28mm rulesets. ALL WW2 rules fudge ground scale against figure scale, otherwise it'd be 6mm playing on basketball courts.
There is a case for 1/72 hard plastic, since fewer manufacturers are doing that than the old standard polythene, but that's not saying much. The vehicle market is saturated in that scale, while their main 15mm competitor (Plastic Soldier Company) is anly a few years old and are still filling their range. Battlefront have started, but are only roughly where WGF are in terms of infantry, though they have a few vehicles.
BF also have the handicap (which also applies to Warlord 28mm plastics) of having a large pre-existing range of metal already sculpted in the old more chunky style. WGF have realistic proportions straight out of the gate, so can potentially corner the market for players who prefer that (which would be a sizable chunk of the WW2 gamers, I'm guessing). And WGF also has no previous stock of resin and metal kits to shift or production lines to replace.