I agree that actual cutting ability (and taking care of the blade) are essential no matter the style or performer. I also think it's important that the cutting technique works well in a martial engagement (this is also reproducible) as opposed to just proper target cutting. There's a lot to consider wrt the original topic, hence the different approaches including the use of swords for tanren or for aikido technical study as has been mentioned before.
No doubt about it. Again my only point is that people not conflate them.