I don't know why you are downvoted since your question is legit. I'll answer given my own experience : At my former company, we had a websocket-based service

I don't know why you are downvoted since your question is legit. I'll answer given my own experience : At my former company, we had a websocket-based service that allowed symetric communication between the clients. We had around 10% connection failures, and we thought it was causes by websocket well-known incompatibilities with some network stack, and we had a fallback to ajax polling. Several month later, someone touched this part of the code and found a data race. After we fixed it, the failure rate dropped to 5%. Is 5% of failure big ? It depends on your business. In our case it wasn't too bad because we had a backup plan. But if every customer have a 5% chance of application breakage each time he connects, you may have trouble building a big user-base.