Everyone has their budget to stay within and at $30 a month, Apple One Premiere is exactly my limit considering there's no AppleCare or devices to bundle on to that. A $100 a month iPhone + iPad + AppleCare would be pretty appealing but I digress.
The hope is that Apple rewards its loyal Premiere subscribers who joined before additional services were added with a slightly better discount OR gives us the option to add them or not. I don't want to pay for Mail+ or Stocks or podcasts. I don't need those services. If included, I would give them a try.
My conservative guess is the only people who have subscribed to Premiere are those who had Apple Music Family and needed Fitness OR were using 2TB of storage and music and thought "what the hell, it's only $5 more dollars for arcade, fitness and news" which is the camp I was in.
If Premiere did not include 2TB with the $30 price, I would have not upgraded. I only use Music + iCloud and have occasionally dabbled in Fitness, Arcade & News but they aren't core to my life.