Seems I have struck a nerve.
No, you struck math, physics & time. Or, more correctly stuck out, on all counts.
Your original point was....
One of the hosts in my area has a casino grade shuffler. The better dealers don’t use it. They go much faster without it.
From a hands/hr angle, it's simply not possible to have a game (or a dealer) be faster (more hands/hr) if you're hand shuffling between hands.
And, while you may consider the ones that don't use it "better", if tips are involved, they're certainly not smarter. If they're getting tipped at the table they should take any opportunity to deal more hands per hour... if they're smart. More hands/hr = more tipping opportunities.
Hand shuffling between hands drops your hands/hr rate by at least 5-10 hands/hr, or more. & you need some of the fastest shuffling dealers on the planet to get close to losing only 5.
Even as a player, given the choice of a table with a shuffler or one without, I'll take the the one with it every time. A dedicated dealer to go with it isn't a bad thing, it's just that the shuffler has a deck ready to go once the hand in play is over. I like more hands/hr too.
At a cash table, more hands/hr equals higher BB/hr earning rate. In a tourney, more hands/hr increases the skill factor of it.
The other option for player dealt games is using two decks per table.