im speculating that in a wild twist of events, MS announces the revival of Netscape Navigator, just to keep all the web developers on their toes and make sure they get enough practice working with cross browser compatability
Internet Explorer had dominant market share, non-standardized features, and powerful corporate backing.
Chrome has dominant market share, non-standardized features, and powerful corporate backing.
Safari doesn't have the newest standards always, but mostly sticks to the standards from what I know. The major difference seems to be a lot of devs liking Chrome.
They both have some parallels to IE in their own ways. Chrome for the reasons you mentioned, safari because:
-Coupled to OS updates, meaning that people on older versions of the OS will also have an older browser, with worse standards support (thankfully apples upgrade policies aren't as bad as android manufacturers, or this would be way worse)
-lagging behind on standard features with less frequent, big updates that still often end up missing crucial things (my prime example is how long it took them to support webp, which they thankfully finally support now, but there's plenty of others)