I find it surprising that the 5S has had 6 more updates since it was dropped from support when iOS 13 was released. The last was just over a month ago.
I hope that this is a sign that Apple will continue to provide security updates even after they no longer provide feature updates.
Of course, the upgrade to the 1st gen SE is the obvious path for those who had a 5S so continued upgrades aren't so important, but it might be relevant with the 1st gen SE if Apple don't release a smaller iPhone 12.
The six got cut off after "only" five years because it didn't have enough RAM to run the current version of iOS.
Now the original SE and 6s will also receive that sixth year of support.
If you bought that original iPhone SE, that works out to $67 per supported year.