Aluminum and plastic windows address different types of buyers with different definitions of "price awareness"
There is certainly some truth to that. The same applies to pairings such as "furniture store and carpenter," "department store fashion and tailor," "discount retailer and organic farm," or "laminate and oak parquet." I can understand the underlying thought process, but I also consider it purely academic. What is the essence of this (fundamentally correct) consideration? Better to buy nothing at all if you cannot afford the premium product? What if you will never be able to afford it?
Especially when building a house, you are constantly faced with such decisions. ETICS or rather a ventilated facade? Roofing with concrete roof tiles or rather with slate? Stringer or cantilevered staircase? Air or brine heat pump? Support column in the room or self-supporting structure? Woodchip wallpaper or stucco on the ceiling? Etc., etc.
Wouldn’t it be much more purposeful to consider where to best spend a generally limited budget spectacularly, rather than financially overextending oneself over window profiles that take up about ~4% of the facade’s visible area? Especially against the background of better marketability, focusing on window profiles seems too shortsighted to me, as long as you do not have the necessary cash to consistently pursue this standard... and who does?
One could also say, "The buyer addressed by aluminum windows does not leave their demands at the front door." So if you are not financially able to fulfill these preferences in the rest of the house, you don’t even need to try with the windows, right?