Technology has already moved. But in this hobby money is the clue. Merchants still support P4/PP users because it gives a hell lots of money. Until most of people with P4 will be rich enough to upgrade, I don't think any merchant will leave eventually money behind. I agree, there should be more support for P5/P6 features. But think about D|S Studio users: program is free (features similar to those of PP), and those people can spend their 200$ on lots of marketplace/store stuff, supporting merchants doing P4/PP stuff, not P5/P6. It'll never end, so just get over it. Ask for more dynamic clothes & hair/shaders/whatever, but don't ask to kill something which is bringing money to some, and fun to others. You say you do understant the situation, and yet you refuse to understand.

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Outdated gallery over at DeviantArt

Fics at FanFiction.net and Archive of Our Own (AO3)