Taxonomy ultimately depends on interpretation. If we have an evolutionary significant population, well, what's significant to you may not be significant to me.
Sometimes, we get cut and dried stories behind a name change. Pelvicachromis taeniatus Woure was a dwarf Cichlid along the usual pattern for its group. Only it's larger, and has some colour pattern differences. When Anton Lamboj researched the past work done on these fish, he decided they were a distinct species wrongly placed in taeniatus. He could have included them in P kribensis. The research and revisiting descriptions and preserved specimens showed the Cameroon P taeniatus had been previously described as P kribensis. The Nigerian and Beninois fish in the were different, and had been described as P taeniatus. But he named the distinct Woure fish Pelvicachromis drachenfelsi.
I'd argue that very few of the hobbyists who had kept and bred the fish had any disagreement with that. The fish was different to keep, and a lot of people were questioning its identity. To unscientific us, it seemed like something different. The work done on them backed that up.
Let's imagine you reject evolution and think all of these fish are one species, in spite of the evidence. You could cross them without any worries. They might in a few generations become sterile. They might soldier on, unlike any fish in nature. I kept and bred them as taeniatus Woure, and would not combine them with taeniatus Moliwe, or Lobe, or Bipindi or whatever. When a scientist revisited the group to look at old research and to do new work, the location name proved more informative than the species name.
Cool.
With killies, we've had similar cases. What it looks like on the outside, and what it is on the inside don't always match. There have been cryptic species. In 2018 a group caught a little Aphyosemion that looked like both Aphyosemion coeleste and A. citrineipinnis, 2 well known species. Research showed it to be e, and it was named Aphyosemion cryptum - hiding in plain sight. If I'd found it based on the photos, I would have misidentified it. If I had crossed it with citrineipinnis, I would have caused it to be lost.
If you breed fish and have access to origin info, it only makes sense to use it.
