Under pr it might be possible to vote for a party better than the traditional choice

The main parties might not be good enough for some voters.

Fptp does not present a problem if all of the political complaints rest along a straight axis, there is only one political issue and subsequently there is no advantage in having proportional representation if we are only choosing degrees of (for example) taxation. It can be assumed that the main parties will adjust such that they will attract sufficient votes so that their political aspirations are not too compromised. If, however, there is more than one ‘axis’ along which people are motivated to vote (and are concerned about) then pr does present an advantage. People who disagree on one issue may have shared concerns regarding another, with Fptp voters must compromise these beliefs but with pr people on both sides can ditch their traditional parties and get what they want. No longer are voters consigned to having to make the choice between ‘left’ and ‘right’ but are now able to choose their preferences according to a richer, broader set of criteria. If there is more to politics than simply left and right, them and us, if there are more nuances then more people get what they want more of the time with pr. The traditional parties do not encompass the totality of political thought, people are concerned about more than the ‘major’ issues.

It is possible for people to want something (a candidate or a party) even better than what is being offered under Fptp.