> nobody wants to contort software to run on a 10 year-old server rack your eighth-biggest customer is still using.

why? those are the clients that bother me the least and just pay every year without whining. I have 20 year old SaaS running in a rack with 10-20 year old servers. I wish all my clients ran like that as it's stable, no modern blergh stacks; it works & is fast.