Windows has never kept "an infinite list" of restore points, but tends to keep them for the last 4 or 5 major actions.

When you get to the Restore your computer to the state it was in before the selected event dialog, do you have the checkbox for Show more restore points checked?  If not, you'll see only one, the most recent one.
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Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

          ~ Saul Bellow, To Jerusalem and Back