Good on you, I was pulling for you and had a feeling you would do the right thing.
Optimization can be a very satisfying game, I've learned that I derive more satisfaction from it than the possessions we are quickly learning to live without.
Your brain is genetically predisposed to a certain baseline happiness level. It's hard to believe how little impact to our happiness material possessions or status really have in the longer term. The hedonistic treadmill works two ways. New possessions or status feel good for a little and once the dopamine wears off, whether it's a few minutes or months in.....we return to our baseline. Getting rid of things we once held dear has been shown to sting much shorter than we think, and again our brain adapts and we persevere and are once again happy, often realizing that we are in fact free of something that had a level of control over us, like your McLaren.
I fell into the "I deserve a nice car" trap in 2016 when our income first cracked the $200k/yr mark. Splurging on what at the time was a "sensible compromise" to a new sports luxury car, I spent a solid $17k on a very clean low mileage Infinite Sports Coupe, a car I lusted after since high school.
Well the novelty wore off, but the rapid depreciation, premium fuel bill, and insurance that's double what I was paying on previous DD are all still very much there. When it came to replacing the brakes and getting new performance tires, I had to cough up as much as the previous DD was worth. I've gotten plenty of rock chips on the front from NY winters, curbed the wheels, and gotten dings in parking lots from careless people. The stress of that alone outweighed any short-lived joy of ownership I had.
I do still smile when I can rip a canyon road or get a few good rev matches which sound glorious through the aftermarket exhaust, but I could easily have as much fun in a $3-4k Miata, and That $15k+ I saved could have funded me months or freedom from work.