In my country, at that time, being a champion of chess was like being a King. At that time I was a King - and when you are King you feel a lot of responsibility, but there is nobody there to help you. ↗
On the other hand, chess is a mass sport now and for chess organisers shorter time control is obviously more attractive. But I think that this control does not suit World Championship matches. ↗
When I played Bobby Fischer, my opponent fought against organizations - the television producers and the match organizers. But he never fought against me personally. I lost to Bobby before the match because he was already stronger than I. He won normally. ↗