[Short Thread.]
There was some evidence that this gave governments an incumbency advantage (since they could time reelection), led to political instability, and made policy implementation more difficult.
Hence...
The coalition government between Conservatives and Liberal Democrats, for reasons of its own, implemented this in the Fixed Parliament Act.
In Britain, voters have very little tolerance for coalition governments and assume that a government without a majority should go back to polls.
Instead of elections becoming more rare as a result of the Act, as was expected, they have become much more frequent.
The failed reform should make us more skeptical of importing "clever" institutions into very different political contexts.
[End of niche thread]