Hey guys. I haven’t even introduced myself, but just I received a correction on my journal entry on lang-8.com that I really want to understand. I tried to write casually today, and someone said this about it:

「いい感じの日本語だと思う。」

I took this to mean something like: “I think your Japanese has a good flow.”, so I replied with “Really? Thank you very much.”, and he said this: 「私はあなたの日本語を最大限尊重した添削をしました。「～だ」を使いたいんでしょ？誰でも新しく覚えた表現や言葉は使いたいものです。」

I have no idea what it means. Could someone help me?