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I am looking at this objectively and find there does need to be some sort of classification, The abstract is well worded. For scientific purposes there needs to be a clear and distinct classification to clearly define what is what they are seeing but 1 major concern.
Dark Matter is mentioned many times throughout the paper yet Dark Matter is not measurable by physical or observable means only by mathematical assumptions that something exist and yet Dark Energy has no mention in this paper. There are some aspects that are a bit over my head so I would at this stage called an in-betweener. But isn't it possible to classify all of these as galaxies except different classes of galaxies so they can be define. To keep it There are 5 primary conditions they are asking for, why not 5 classes of galaxies. Seems simple, All except for Dark Matter can be measured. Although they are considering multiple minimum conditions which means there could be as much as 25 types of galaxies although not practical.
This last measure is a concern that has been growing over many years that Dark Matter is a assumed measurable substance. Maybe they leave that as a potential type of galaxy class until the measurable.
Unfortunately Dark Matter to the general public is measurable, I used to be general public. The way it was talk about when I was a bit more Joe Public is they could measure it physically.
Although Pluto was unavoidable for which I agree with the finding, Galaxies can at this stage be tampered with while still being seen by the general public as a galaxy.
The survey though is a bit iffy. Not sure I like the simplicity based on a very complex paper (to the Joe Public).
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