[pdimitar]

I keep hearing that argument my entire career... and I've attended at least 7 instances of it being very false.

The point is, nobody is even trying to do what you also renounce -- hence there's an inherent confirmation bias in the claims of "rewrites are hard" or "in-house frameworks fail". I think we should recognize that.

There are ways to surgically and gradually migrate away from a slow technology. I've done it several times in my career and my only fail was a failure of not knowing all business requirements -- lesson learned, never made the same mistake again after.

I am pretty sure in in orgs like GitHub and Shopify the business requirements can be gathered and catalogued. It's all in there.