Unlike Steem, Bitcoin is a deflationary currency.

This claim is quite misleading - the opposite is true. You are confusing limited supply with inflation - these features are not mutually exclusive. Bitcoin has a limit of total supply and has been highly inflationary. The rate of inflation is gradually decreasing but it's still substantial.

Steem with Bitcoin are fundamentally different.

Again, I'd say the opposite is true. Steem with Bitcoin are fundamentally similar and actually this similarity is what gives Steem a lot of credibility. The main difference is that Bitcoin spends newly created tokens on burning electricity, whereas Steem - on rewarding content creation & curation.