From the sound of it as well, and realize that swguy as well as I, probably use some form of comparison software to implement the upgrade. There are changes being made to make the process easier by offering ways that software can change operation without modifying the core files.
Part of why I bring that up because (well actually wrote it before a more recent post asking about a recommended process) is that regardless what editorial content is provided or missed, operation depends on the content of the file(s).
As to the most general recommended process:
http://www.zen-cart.com/entry.php?3-...d-of-upgrading
As to the "best" way? There is a lot of variation that is possible. Different changes to the cart require different ways to approach. It depends on what changes have been applied and in some cases whether anything needs to be added at all. In a comparison of older ZC versions to recent, the ability to have multiple admin users required a plugin, whereas that is a standard feature now.
Regarding the future? There is a version 1.5.6 that is still in development and there is a relatively complete rewrite that is being worked on as well. 1.5.6 is expected to handle php 7.2 and further support nginx. But yes it continues to be supported for upgrade and compatibility with newer technology. Just because it is on subversion f doesn't mean that there isn't more expected. It basically means that the changes that have been made/suggested do not meet the criteria to step up a version number...
In other words: what they said. :)
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