Why do a change from one OSX version to another OSX version?

It seems to me that Mavericks OSX is NOT an upgrade.  It seems like it is a side-grade since I would still be using OSX, just a side to side change….  The first response noted that some people  have difficulty with iPhoto after doing a side to side change to Maverick.  I use iPhoto all the time, don't want any problems with that… and another said that the Time Machine backup no longer worked after the change from OSX (Mountain Lion_ to OSX Mavericks)…  That is my backup program and I certainly don't want any problems with that.  So my ? remains…. why do a side to side change from one OSX to another OSX version???  The answers received are not answering that ?.
Your replys and comments are appreciated.

The reasons for upgrading are:
- Security (there are a myriad of behind-the-scenes security improvements, and some foreground improvements in programs and system services)
- Service compatibility (ie, syncing services like iCloud)
- Application Compatibility (as programs develop, they will drop support for prior versions of OS X).
- Latest and greatest features, if you find them useful.
- Hardware compatibility, with peripheral devices that may no longer support an older version of OS X.
OS X is not just "OS X" with a bunch of peripheral changes to it. There are a number of under the hood enhancements and changes that have fundamentally altered the OS from one version to the next over the years, be it from the kernel all the way through how accounts are handled, to how background services are run and otherwise managed. Granted from one version to the next is sometimes not as significant of an upgrade, but for the most part there are significant changes. In OS X Mavericks, Apple has added major changes to memory and process management, which offer potential to greatly increase battery life, and/or reduce power consumption and wasted CPU cycles.
Of course, with any upgrade you will get the potential for drawbacks, such as initial break-in hiccups.

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