The problem is that Netflix is not interested to make its app work on microG (/e/'s substitue for Google play services). While they spend a lot on ensuring the best user experience for Google play service users, they do not really care about microG at all.
As a result, Netflix might work at some times but it also might fail and then, likely, fixing this will be no ones top priority.
So if a working Netflix App is a top priority criterion, /e/ is not the right OS for you.