nobody wants it. Waiters dont, restaurants dont, costomers dont. The tip in theory is still optional, the extra $5 on a meal isnt.
You might think this is what you want.. But your wrong. Youd be pissed when it took 30 minutes to get your drink because they only have 2 waiters on and the place gets busy out of nowhere. And you will pay more
Its just the way the world works. Places keep extra staff on hand so that if it does get busy everyone is happy and served. Theres a very high standard for service here and its because of the tip.