Checking for blank in Flow

A few days ago I asked

am i the only person who is still confused about equals globalconstant.emptystring vs isnull = true in flows? i swear i used to use equals gces all the time and it was fine or was i delusional. seems like isnull = true works most everywhere now. is there any clarity on where one might use equals globalconstant.emptystring?

It seems like a pretty simple question - how do I tell if my (X) is blank / populated.

the X could be

It seems like the answer is to use isNull, but seems like its not clearly stated as such. And a few folks agreed that this seems to have changed over time.
So, to try and settle how things currently behave, i am going to test to see how these options behave in the scenarios above.

This is gonna suck. But actually solving this will be a great leap forward - for me anyways.

 
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