WITHOUT ever speaking to anyone on the phone or by email, you can scale even $1M a month and get auto-scaled (very deep) discounts with big providers like AWS who certainly have enough "enterprise sales" to waste everyone's time on the phone, suggesting there's no good reason to make anyone talk to your SaaS if they don't have to.

If they have to, because they don't know how to use what they buy, that's one thing. But don't force a call to, let's say, sign in with OIDC or turn on audit logs.