I've had most of my forum accounts longer than most of my phone numbers and email addresses, and this forum account has already outlived at least 2 of my phones (although not my phone number). I consider losing my phone much more likely than losing access to my account, and in that case it will only lead to more support requests.
That's now what I tried to say. I'm simply asking that before you can change a critical part of your account (like email or password), you should receive an email at the current email address and you have to confirm that you really are the person who initiated the change. That means to click on a link or get a confirmation code in the email. Without using that link or confirmation code you should not be able to make the change you want. Of course it is possible that you don't have access anymore to the current email address, so an alternative way of confirmation should be available (a second email, sms, phone call, 2FA code). Sms or voice call are not something that some people would want for lack of anonymity, but the other 2 can be safely used from this point of view.