The original early muzzleloader season was flintlock only, that was when the determination was made not to include bucks. It wasn’t until several years later that inlines were allowed since it was doe only and they wanted more does killed.
When the flintlock was originally introduced they were killing between 20k and 30k does a year, assuming similar harvest ratio to rifle season and you are looking at an estimated 15,000 more bucks per year which was deemed “to high to allow”. Meanwhile the Archery buck harvest has increased by 52,000 since that same timeframe yet when the PGC was allowed to open Sunday hunting the early archery season got every single Sunday opened guaranteeing a significantly higher buck harvest this year with essentially a full week of high impact days.
Meanwhile flintlock, which kills less than 1% of deer, the late antlerless rifle, specifically opened in specific areas to kill more does and the late pheasant season, which has no deer hunting to start and overlaps with flintlock and the late rifle before continuing after they end got zero Sundays.
I’m sure crossbows helped to increase the harvest as well as the media focus on big bucks and hunting the rut and all the other things that have greatly increased participation in archery season.