Prices have definitely gone higher. My Tampa cruise on the Pride March 24, 2024 8K balcony I paid $1817 with prepaid gratuities in April 2022. Same room category same cruise is now $2828 which is an increase of 55 percent in 15 months!
As far as gratuities go, I think Carnival's current method is best. When you are compelled, it is no longer a gratuity. I think having the option to remove keeps the workers on their toes to provide good service as most surely do! Besides this issue, I am guessing there would be some tax consequences for Carnival if it became a mandatory charge.