The alternative to this is that when I compare prices of different flights I see the correct full offer for the price I want to pay. This flight is not the only available flight. I would have chosen a different flight on Google Flights if I had known that there are no seats available at this price. But now I am 10 minutes into the process and just want to be done.
What is a dark pattern by your definition? A literal picture of a pattern colored dark gray?
This is a misunderstanding. Airline does not tell that you need to pay more. You can click on Continue button and complete the purchase. Even the popup you have shared tells you exactly this.
Try reserving a specific table at the restaurant. An hour before the dinner.
For some reason you fail to acknowledge that features listed under the price must be included in the price.
> Try reserving a specific table at the restaurant. An hour before the dinner.
Restaurants don't allow you to go through the reservation process to only suddenly mention at the last stage that the table has no chairs, or no table top (just table legs).
Are you under the impression that they are going to make you stand up on the flight?
This fare comes with preselection over a limited set of seats. There are no more seats available for preselection in that set. If seats were available you would have been allowed to select them; otherwise, you will be assigned one at the gate.
It is very unlikely that you will be involuntarily denied boarding, and you can be denied boarding in the event of an oversale even if you have an assigned seat.
Note: your fare never indicates that you are buying a particular seat. Please read your contract of carriage closely. Maybe this part (not the offering of the ticket you're complaining about!) is a "dark pattern" (nobody reads the contract of carriage) but it's just literally how airline tickets have always worked.