It's just progress. Some people move with progress or forge ahead of progress and some are left behind. I think this site gives you enough commentary on the subject to help you make a decision, informed or otherwise.
I went from 2K in 1966 very quickly to 3K and in the 70's went to 5K and now I'm between 5K and 10K. I find a UOA good for determining the condition of the oil and less so for the condition of the engine, transmission or differential. Yes, I drive an old fashioned style vehicle with a separate differential and my daily driver has a clutch pedal. For you younger drivers it's a manual transmission that requires the driver to shift gears but don't worry, you'll never need to know about that kind of stuff.