The other player will also gain from 25w houses, so he can afford a mining camp earlier than usual, or even opt for a faster feudal advance because it would be more economic.Please note that 25w houses also means an earlier barracks, as you usually make four houses before building a rax when drushing. => improves drush to FC strats.
If those 25w houses come again it would be a good idea to increase militia train time of two sec.