I care because it&#x27;s a convention.  Without knowing too much about Angular 2, I know that it&#x27;s got major breaking changes compared to Angular 1.  Likewise, I know that a 1.15.2 should upgrade from a 1.15.1 fairly trivially, whereas a 1.16.0 might take a little more consideration.<p>With all that said, the responses to my question are very reasonable, such as &quot;people I know and respect have used it and stated sane upgrades historically.&quot;  In the absence of this piece of tech in my own social circle, SemVer is a convention that Facebook will have to live up to.  6 months to a year after Facebook switches to it, I can research how reasonable they are with introducing breaking changes and supporting old, stable versions.  I believe that more people will be vocal about a major breaking change post 1.0 than pre-1.0.