This is ridiculous, IMO. When you go out to eat you should optimize for pleasure, not the difficulty of constructing a dish. Avocado Toast was chosen in the "young people suck" articles because it was trendy, not because it simple.
Look at the other complaint - espresso drinks at cafes. People whine that young people could save more money if they just stopped buying lattes. Given that virtually nobody has an espresso machine at home, this is the polar opposite of the "well, you can make it at home" situation.
No. The complaint is "young people should stop complaining about their economic fortunes because it is their own damn fault." Nothing to do with trading money for convenience.