I can totally relate to the what the author is saying. I went through a mini-version of the same journey.
For a while I was buying expensive beans, grinding them on a Baratza Vario (a mid-level grinder) to make espresso in my E-61 based heat exchanger machine. I made some excellent coffee with that setup and more than a few sink-shots.
I gave it up though because I found that the better I got at making coffee, the less I enjoyed it in general. I couldn’t enjoy a mug of diner coffee. I couldn’t drink the stuff they give you on an airplane or at a donut shop. I couldn’t deal with k-cups that work provided so I brought in a kettle and aeropress.
I’m better these days. Like the writer, I’m now able to enjoy just about any coffee I can get my hands on (although IHOP coffee still seems impossibly watery).