And I'll just say that's a very myopic view
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It's faulty logics here too (with the OP). iOS users do get regular FULL OS updates (and across devices at the same time). However, Google has set up Android now where all the core apps, and many of the functions controlled by play services are updated (and frequently) through Google. It's a different model than Apple uses. So it's not like the OS isn't really updated... it is.
For many features and SOME security updates, Android gets updated. But most of the major security issues (especially the recent ones) have required an update to the actual OS, and is not available through Google Play Services. Which means you're right back to waiting for the OEM and/or carrier to make the update available. Or you don't get it at all if your phone is 1-2 years old.