i think all the points are good food for thought, but the pros of having a cofounder FAR outweigh the cons.
as long as you do a good job recruiting the right sidekick(s) and maintain a transparent work relationship, you should be able to avoid many of the disadvantages.
more than anything, you're bound to have highs & lows, and a cofounder will be there to pick you up & get you back to speed when things are not going your way.
plus, the journey is much more fun when you have others to experience it with!
as long as you do a good job recruiting the right sidekick(s) and maintain a transparent work relationship, you should be able to avoid many of the disadvantages.
more than anything, you're bound to have highs & lows, and a cofounder will be there to pick you up & get you back to speed when things are not going your way.
plus, the journey is much more fun when you have others to experience it with!