Yes I certainly understand that and I don't know anyonyone that would argue that walking 6-8 hours a day in the Selous would not be either fair chase or ethical. As you say, it is virtually impossible to set rules or guidelines that are applicable to every situation.

In restricting the use of vehicles, I think I had in mind those kind of safaris that you can get in some countries where for instance, you drive along and shoot an impala in the morning; drive a bit more and shoot a kudu in the afternoon; get up the next day, drive along and shoot whatever else.... and so on for 7 days.

This is quite different to using vehicles to get into an area and finding a set of tracks and then following on foot with no guarantee of finding a suitable buffalo or elephant at the end of a long, hot, exhausting day.

JMHO

but I accept that not everyone is up for, or capable of that