It is true that Arsene Wenger and Sir Alex Ferguson are long-standing practitioners of high-risk, attacking football, but their core beliefs have been aided by recent rule changes.
Part of Ferguson's longevity is his willingness to adapt on and off the pitch and he has acknowledged that in the past few seasons Manchester United's style, particularly in Europe, has evolved into what the former Roma manager Luca Spalletti called 'more Italian than the Italians'.
'We had a spell after we won the European Cup in 1999, when we were disappointing and had to change our thinking. We lost to PSV Eindhoven and Anderlecht away and there were some others, all on the counter-attack.'
Put those two factors together and there is more attacking space.