I have no time for slow play but as to compulsory foursomes play - ie alternate shot - well ............
Image playing this format in your one and only round at TOC and it's the other guy who gets to tee off on the 1st and the 11th and the 17th!
Or again, imagine your one and only round at CPC and it's the other guy who gets to have his photo taken actually teeing off on the 16th!
And vice versa in relation to the other guy if you're the one who's fortunate/smart enough to get to play the famous shots.
Plus, if your playing it properly, with the non-hitter 'walking on' to where the other guys shot is likely to finish, well you only get to chat to one of your playing partners.
Greensomes now, where you both tee-off and then choose which ball to play the rest of the hole with, that's another story altogether. A format that isn't played enough IMO. Quicker than 4bbb but with more tactics and strategy than foursomes and you get to chat to all you playing partners too.
atb