I think it's a matter of taste. I am doing two languages in one post too, if the post is quite short, but I usually prefer seperate posts. One reason is that a lenghty two-in-one post is inredibly much work. Believe me, I tried it. Also, I'm not very comfortable having two languages mixed in the comment section, with half of my readers not being able to follow discussions.
But honestly, one reason is also the rewards, because I have people voting for both, so I get more rewards if I'm splitting the post.

Yes, I'm also going to split my posts to get more rewards and you're right, It looks tidier.

Coin Marketplace

STEEM 0.27
TRX 0.07
JST 0.034
BTC 24454.90
ETH 1979.40
USDT 1.00
SBD 3.39