Separate from that, it is not productive for you to tell me to think about it more -- for all you know I've implemented two factor authentication in various forms for decades (from OPIE when I worked at NRL to Smartcards within DOD to Passkeys currently). What would be more productive is to get more insight into what you're thinking
If you have access to somebody's email you can just click reset password and then click the "2FA" in their email and then you have access to their account
The same situation seems to be true of SMS, if you have gained access to their account then you can use that to perform 2FA as well. In this situation, it doesn't seem to be significantly different in terms of security.
To answer your question on whether or not people access other people's SMS accounts -- yes! That's one reason it's not recommended any longer. Additionally, there's often less security possible for ones SMS account versus ones email account.
You would have to get access to their email and SMS to perform a password reset and get past 2FA. If you are saying you could do a SIM swap attack simply by having access to their email I think that is not that practical at all.
> To answer your question on whether or not people access other people's SMS accounts -- yes!
What? I never asked that? What are you even talking about?