Not sure I can agree with you here.
Hive IS a dApp platform. There are 50+ Hive based dApps which are among the most successful and most used (by real people not bots) of all dApps in crypto.
Hive is extremely easy to code dApps for, unlike Ethereum where Solidity expertise is rare and open source often fails to pick up flaws in time to prevent hacks, because too few people have the necessary expertise.
Smart contracts are already available and being used on Hive, as a 2nd layer solution (which is where they should be - first layer smart contracts are very problematic).
Hive smart contracts may have some limitations but they are not really an issue in practice.
The the actual use cases of completely flexible (Ethereum style) smart contracts are quite limited - to high value financial smart contracts such as for ICOs and DeFi.
Ethereum has already taken this crown (despite fees and hacks) because people are only going to entrust large amounts of money to the longest lived and largest market cap smart contracts blockchain.
For low value transactions and content, games, social media etc Hive already has everything needed, and the advantage (that BTC and ETH also have) of having survived a long time and having big active communities.
I'd be interested to know what the actual dApp use cases you propose for Koinos that can't already by done on Hive or Ethereum (for high value).