The "You Probably Don't Either" is a little presumptuous. Many projects probably don't need cloud run either. Certainly, many projects shouldn't even be started in the first place.
Your friend lives 1/8 miles away. You go to see them every day so why wouldn't you drive? Well, cars are expensive and you should avoid them if you don't need them. There are a TON of downsides to driving a car 1/4 of a mile every day. And there are a TON of benefits to using a car to drive 25 miles every day.
I hate to quash a good debate but this all falls under the predictable but often forgotten "it depends". Usually do you need kubernetes == do you have a lot of shit to run.