I think your information here is actually quite out of date. As of Brew 3.0.0 (released early February), it's now recommended to just install the ARM version, and that error doesn't occur.

In my experience, more packages are working natively on ARM than through Rosetta, although there are a few exceptions. Even that thread you've linked regarding status has gotten quite out of date. For example, openjdk has worked just fine for almost two months. To get a better idea of whether a package is natively supported via brew, refer to brew.sh.

I'd recommend switching your terminal back to running normally, and installing brew from scratch. You may want to delete your old /usr/local/homebrew folder as well. As you say, if you need Rosetta brew for a specific package (I use it for Zookeeper, atm), just install brew under sudo arch -x86_64. It'll automatically install itself to /usr/local/homebrew, while the native version will install to /opt/homebrew. You can even make an alias for it, I use ibrew (Intel Brew).

Thanks @Hazzard13. It does appear things have moved on somewhat since I last looked at this.

One thing to bear in mind - CodeClan's fork of this script is designed for a specific set of users. Trying to be on the bleeding edge can cause more problems than it solves - especially for anyone maintaining it.

Sometimes - stability + simplicity + consistency between users > perfectly up to date + optimal

Great that you pointed those things out for us @Hazzard13 - some good observations and great tips - so thanks. As well as a couple of things that don't make sense.

Anyway - we LOVE that the future is aarch on darwin and we're open to Aarch versions of the script if you'd like to PR? - but they'd also need to give good compatibility across the vast majority of older intel HW not to mention an array of different versions of OS. Let us know