Not everyone who leaves does so intentionally.
There are a multitude of reasons that can cause someone to disconnect from a game unintentionally.
The current system is already unfair to those people who should not be punished at all.
As such, I vehemently oppose your request to further villify unintentional disconnects.
The actual best solution to the problem of leavers in Competitive is already in game in other modes - backfill.