Yup, it's big on the proto lather up front. You have to forge ahead. You are rewarded when you do, but there are a lot of good soaps that don't require that and people have become accustomed to them. If you use Williams daily, it starts to give you the good stuff quicker. Most rotate it and thus have to work for the lather each time.
I can also note that, despite what I heard of using boar brushes to bite into Williams, my badger brushes seem to lather it best. Most likely the retention of water and heat of the badger hair. Heat helping to melt the soap and water to pull the soap into the brush and start the lather.
I can’t recall my experiences with synthetic and Williams. Guess that’s the lineup for the next shave haha