@Galen ******
This is rarely relevant for single entry type visas - of which the vast majority are. They’re valid for 90 days from issue. Most people don’t apply 3 months prior to travel.
Where it does have an effect is a multiple entry visa where it’s valid from issue date and the clock starts ticking from that moment. You want to leave those to the last minute to get most value from the visa. It’s a coin toss in many cases.