That's a total straw man argument.
It doesn't take "a month of fiddling" to add an integration like this. It's already readily available[0] and has been for half a decade. It's also $24 per month — not $5 — at their current scale. These aren't amounts to be sniffed at either. The $720 a year they're paying for "frontend hosting" is not far off what I pay my accountant.
[0]: https://blog.trello.com/github-and-trello-integrate-your-com...
