I agree. Why specify 'shows' in the English if it has no bearing on the Chinese?

I've learnt that"真人秀 " is "reality shows" ( it's also a loan word). So I wonder can I use that word?

Duolingo's own grammar notes say this as well, but it's still not accepting it without 的. Reported.

I've come here because of the same problem. In the later levels it even teaches that you can omit the 的 when talking about family.

So did mine

Actually when adding nationalities to your object you will never hear a native speaker use 的. The same goes for languages. Eg. 英国电影，日文歌，英语书，中国舞