"The grass is always greener on the either side of the fence" as the old proverb goes.
An advantage of Debian's firefox-esr is that webext-https-everywhere and webext-ublock-origin-firefox, and other packages can also be installed from the main repository, which provides an additional layer of security.
I think alternative methods of downloading, installing and configuring upstream or third-party software are contrary to the rationale of Debian, which is to provide tried and tested software, installable via apt, from its official main repository.
The latest upstream applications may be OK or even better for normal browsing but increasingly, server administration is done by means of login and passwords over web interfaces; think, for example, of phpmyadmin, cockpit or wordpress when surely firefox-esr would be preferable. Although there are a lot new Debian desktop users who are accustomed to, and expect things like "the latest firefox", "snaps" and the like, Debian continues to be pre-eminently a distribution preferred by sysadmins who have little interest in such things unless they're also developers of such software.
But the good thing is that there's choice; if one wants SNS then one can have it.