If you spend 10000 sats on a ham sandwich today, does it have the same value as 10000 sats in 5 years?

Perhaps. 🤷‍♀️

If you skipped the ham and ate plain bread for 5000 sats, you would have 5000 sats more, in 5 years.

Why ever eat ham, again?

I think you can drive yourself literally batty calculating all value this way, and lose all ability to enjoy the present. There's no end to this doom loop because sats will never go down in value.