You're not the only one to say so

That said, you don't have to use what you don't want and the lower price tiers only have the mail.

You are the crazy one.
You're literally complaining about getting more products and services for the same price.
Do you have any evidence that your imagined Mail+Calendar service would be cheaper or better, if not for all these other things? Or is it all just assumptions on your part?

I genuinely don't understand why you and so many others apparently Want to dislike Proton. Want to dislike it so much, you make up these silly nonsensical excuses.

Did the price go up? Or did you just get more features that you don't need to use?

It definitely gives me a weird feeling to see them becoming bigger and more all-encompassing. And the way they bought SimpleLogin and did nothing with it but keep the dev too busy solving problems to implement any of the features that were planned up until that point didn't really give me a great impression of them as a business, either. I stopped using them a long time ago.

I do worry that that their service sprawl is going to detract from overall quality of said services. Email, Calendar, Drive, and VPN would have been a perfectly fine ecosystem. Now they're doing AI shit too, I guess?

You're paying the same price that you started paying years ago, which you must believe is worthwhile because you've been paying it foe this long, and you have more features available to use, which you can choose not to use. This is a ridiculous complaint.

Either provide a "Mail+Calendar ONLY" package for a discount or prepare to lose a customer.

...they already offer exactly that.