Why is it bad programming to use a stateful webservice and why would it be allowed?

Question

I have a need for a stateful webservice in our organization. However, everywhere I read online says that building a stateful webservice is bad programming but nothing ever

Answer 1

I think it is a kind of myth

If google can make their stateful web application scalable, then why cant we scale a stateful webservice. It is all about the app server which reduces the scalability.

Even with a website or webservice, ultimate aim is to serve better. If a "stateful" is to improve your service, then don't hesitate to go with that.