No it doesn't, cause you do not seem to understand how it works. Only mandatory technologies that you have to do to continue in your techtree count when it comes to autocompleting quests. A tech like the 600 diamond house is not mandatory, so even with that one open you can autocomplete, but you only autocomplete when you have reached the end of VF part 1 when it comes to techs. A tech like the 600 diamond house you can however use when for example you are at the end of Industrial and do not want to go up. In that case you can use an old not mandatory tech, provided you have left some open.