Earlier quoted context omitted.
But it's also important to realize that it is "doing it bad" if you are hoping to run a 4 minute mile but your only training is slowly walking around the block forever. At some point you have to seek out more substantial books. You can't just continually read pulp fiction and think you're going to improve at anything; you have to progress.
Improve at what? Pretentiousness? Book people really hate to hear it, but literary fiction follows Sturgeon's law just as much as Sturgeon's own genre. 90% of it isn't worth reading, and that includes 90% of what's fashionable at any given time. You're better off reading books you enjoy than suffering through garbage that you're told you're a bad person if you don't read. (Literary fiction isn't bad. But for the love…
You could stick to the old stuff, but I think it's also enjoyable to read things written by people that exist in the context I exist in. I don't know what "fashionable" means to you - likely best seller lists of awards? - but I don't find it all that difficult or burdensome (in fact, I find it fun!) to look for newer books dealing with topics and themes I'm interested in. Sure, not all of them are great, but a few are, and many are good. It's a little less fun TO ME to ONLY read consensus lists arounds "top books of the 70s" or whatever.