That's... literally comparing them. The comparison for some use cases might not be favorable for ClickHouse, but they're comparable.

(IMO the slowness of ClickHouse joins has been overstated, especially since its many-column table support is so good you'll probably be fine joining on insert instead.)

Yes, this is one major hurdle they need to overcome, but I think they'll (Clickhouse Inc + the community) pull it off. It's a current weakness but by no means unsolvable.