Nothing but a passing fad Bob. We've long since reverted to breaking with the white.
You asked for that one.
I don't think Hendry introduced this, you could always go into the pack from the blue. He certainly introduced the much more aggressive approach of going into the pack at any opportunity. Previous generations had been cautious 'percentages' players who would run for cover at the first hint of an imperfect angle, and reluctant to split the pack unless they were 'certain' to leave a red. The foolishly gauche Hendry suicidally smashed the pack open from anywhere, and suffered the inevitable consequences of having to stay on his feet for extended periods of the match while his more experience opponent conserved his precious energy in his chair, thereby being in a much fitter state to unscrew a cue or phone a taxi during the latter stages.
The game has never been the same since.
Boro Nut