If you insist that 2+2 equals "3 or 5 depending on perspective", ok sure let's work with your scenario of comparing registering a pre-existing state/telco ID with creating a brand new user/pass account (again: instead of what I asked you to compare). Well, suppose you were to lose your ID and/or your SIM - do you think you'd be able to renew them and regain access to your stuff in the same amount of time it's taking me to write this now?
Plus, I guess you've never seen bad actors buy fake ID/SIM accounts faster than you can block 'em - and much more quickly than any individual good-faith actor (with a single ID/SIM honestly linked to meatspace) would able to get out of harm's way in such a scenario.
>What's easier, using a tool that's already in your hand or going to the tool store, searching for a new one, and swapping to that one? Just using the tool already in your hands, that you're already using, that you've been using for a long time.
Hammers, nails... You're trying to make it make sense by dumbing it down.
In the end (again conforming to your framing), the "easier thing" is the one that fewer people will expend energy to prevent you from doing. And this last consideration kinda-sorta makes your reply be an answer to my question, except that I had to do the work of connecting the two, so now you owe me 100EUR.