This absolutely is not a non-issue for people like me who've been getting masses of coding work against github done via Chat without affecting usage.
We use Chat precisely because of that!
It's not unreasonable for them to switch but you really should not be so dismissive, this will likely have a massive effect on many.
But that's exactly the reason why they had no option but to merge.
This is a way of misusing the system and taking away GPU from people who are paying for metered work and the quotas became unsustainable.