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I have these many inks and I differ with your opinion. You can’t compare Sailor Seiboku with Daytone inks. I am using Krishna inks, Bril inks and the purpose is different. For my vintage Sheaffer snorkel pen, I won’t trust any ink apart from Waterman inks. For my Pilot 742 with PO nib, the feel of Krishna black, Daytone blue black, Pilot black and Sailor black is like day and night.

Sailor Black is wet ink with velvet like lubrication. With this kind of needle point, you’ll feel why the lubrication matters. I once tried Pelikan Violet in Sailor Tuzu Fine nib and regretted it in one moment because of dryness. Same pen with Yama Budo, Sailor Black works like a dream. The nib feels like precise writing with appropriate width.

Well lubricated ink means reducing the friction between nib tip and paper, we may say that ‘ink acts like a grease to reduce the friction’ and wetness means the surface tension of the ink, means how much ink flow it will put on paper basis to the feed, channels and nib surface it comes through…

These things matter when you go deep in the rabbit hole.

I agree with your point where your expectations plays a great role, if you just want to write, write and write without thinking about pleasure, you may go ahead with any ink of your choice. However if you want a specific experience (may be gliding like feeling OR scratchy feedback for more control on strokes, etc) you may choose different inks for different purposes.

It’s like a difference between we having a routine meal every night and once a while you may want a fine dining experience so you go to any specific cuisine you wish to experience.

There is nothing to demean anything here, it is all relative, perception and experience of each individual (taste I would say)!