What you describe is the reason why such systems turn into two-party systems.
The electoral college and "winner-takes-all" mechanic is what turns it into a two-party system. A parliament with proportional representation based on popular vote could easily be a plurality, as is indeed the case in most places with that voting system.
Tom Cruise joined it and went nuts
You could question the order of these two events.
Because the purpose of every country's legislative branch is to add laws, not remove them.
Actually, this is a flaw exclusive to the common law system. In systems with civil law, it is fairly common to have the legislative body remove old laws that no longer serve a purpose or have been replaced by modernised versions.
It is also a plus that civil law can be applied in the smallest matters without thereby adding new laws through precedent, though I'm sure it makes cabbage feel more important.