I'm still mourning the day MS Flight Sim 2020 went on sale for 85% but they snatched it from my cart before I could purchase it and corrected it to 15%.

Wildly inaccurate.

There are currently 1,189 Steam games discounted at 70% or higher with a minimum of 5000 reviews, including The Witcher 3, Hearts of Iron IV, Cyberpunk 2077, and Deep Rock Galactic:

https://steamdb.info/sales/?min_discount=70&min_rating=0&min_reviews=5000