Aligned fermatas in keyboard music

Is there a rule that in keyboard music, fermatas should always vertically align?

The Bride’s Song, Strelezki, Ed. Carl I find

would this be better (correctly?) written as

For some reason, Carl used 4.-note and not Dorico’s default 4-8, but we disregard this error and just focus on whether the durations should be adjusted so that the fermatas align, e.g. is this

more correct than

I could not find anything about it in Gould.

I don’t believe there is any such rule.

But note that technically in Dorico the hold duration is different for different value notes.

No, not at all.
And Dorico handles the placing correctly and automatically.

What additional information would the organ player get by this notation?

This is the crucial question, in this and so much else.

In an instrumental part, it is often essential for a player with a long note to know exactly where the fermata is within it (particularly if the music continues); but for one keyboard player, at the end of a piece, the first example is absolutely correct.