Yes, and I think we should view many more tournaments as "two-stage" events like this.
For example you might have
256 -->32
128-->8
64-->16
64-->4
AND --the point I really want to make--
128-->2
64-->2
32-->2
16-->2
8-->2
In each case the first stage is double elimination and the second stage is single elimination that can have the same or a different match format. For instance, the second stage can be longer races or have a "win by 2" component, etc.
Notice that by framing it like this, we have just gotten rid of the godawful feature of a sometimes-second-set in the finals for a double elimination tournament. And we've done it in a logically consistent way. The purpose of the first stage is to qualify for/advance to the second stage.
We no longer have to say a tournament is "modified" double elimination or double elimination with a sheepish asterick. We can acknowledge that that really has all along been a stupid format...
Note that if you set up a tournament in Cuescore, which is being used for tournament series in many different countries, tournament formats are coded like above--There is not even an option for what is sometimes called "true" double elimination.
https://forums.azbilliards.com/showthread.php?t=492580
