1. 10% of your time doing devops work isn't necessarily a waste - if 10% of that time is cheaper than enterprise offerings, then this is probably worth the resources, unless you are very short on talent.
2. You have an assumption laden in this comment that SaaS products eliminate the need for spending time on "devops work." It can greatly reduce that time, but IME even administrating a SaaS product can come with a ton work - look at EKS, a "managed" kubernetes cluster, but often requires a lot of kubernetes know-how to properly configure and maintain.