Oh please. A 25 degree difference is hardly a crisis. Ovens fluctuate by that much just from opening the door to peek at your food. You act like you discovered some great mystery when really you just needed to rotate your pan halfway through baking. I have used ovens my whole life without a thermometer and my cookies turn out fine. Maybe the issue isnt the oven, maybe its your recipe or your technique. Anyway, if you really care that much, just buy an oven thermometer and move on with your life. Its a five dollar fix, not a life changing revelation.

My dad still has his Galant from 2003 in the garage. That thing has survived three moves, two kids doing homework on it, and me spilling coffee on it weekly for years. I bought a fancy new desk during lockdown and honestly the old one felt more solid. The new one wobbles if I type too hard. He paid like 80 bucks for it back then and it outlasted every piece of furniture I ever bought new. Sometimes the simple stuff just wins and we overthink it.