Sounds like you ought to get mad at Mathematica for selling 32bit MacOS software in 2019, which it's been well known for over a decade that support will eventually be dropped.
Hardly been "well known for over a decade". A decade ago, Rosetta was well-supported. The dropping of Rosetta support in Lion was quasi-abrupt, but understandable (it arose from a licensing concern after the tech was acquired). The 32/64 transition was announced a few years ago, but it was hardly something known a decade ago.
The history of Apple suggests that when they come out with a new development environment, it is well advised to just go ahead an make that switch as soon as possible. Even if they make a bandaid type of stepping stone like Rosetta, don't lean on it permanently. Adobe had to skip an entire version of their software suite because they didn't believe Apple was serious.
The last 32 bit Mac was released in 2007.
If the last 32 bit Mac that Apple shipped was over a decade ago, why wouldn’t you port your code to 64 bit?
What wrong with running decade old software? What if the company is long gone? Apple is forcing me to never upgrade.
In the grand scheme of things, how many companies do you think wrote software for the Intel based Mac between the beginning of 2006 when the first Intel based Macs were introduced and 2009 when Apple dropped support for 32 bit Macs and then went out of business?