alt Hacker NewsIn countries like the US and UK with FPTP voting systems, proportional representation would help a lot. As it would make it a lot more viable for candidates outside of the main two parties to stand (and actually have a chance of winning).
(although in a UK context, it's looking highly likely that we'll have a "changing of the guard" in the next election with both Reform and Green party making significant inroads at the expense of the more established Conservative and Labour parties)
FPTP will just guarantee that nothing meaningful can be done. Too much compromise in decision making is bad.
Personally I think ideal set up is a system which grants quite a of power to a small handful of people, but makes it very easy for those people to be removed. This is typically the model that works best in business and other cooperative pursuits anyway.
Throwing more people in the room with different opinions will ensure significant decisions can almost never made. Any policy too far to the right or too far to left will be watered down. The result is that you'll be led by centrists who can't really change anything and anything they do change will be disliked by everyone.