Samsung Galaxy S5 checks all of these. I prefer it with Lineage 14 (Android 7), but ran it with Android 8, and it can support up to Android 10 or 11 IIRC, although later versions are somewhat slow.

Samsung Galaxy J7 (2015) might also fit the criteria, even though it’s not a “flagship”.

If you’re looking for alternate OS list for smartphones and tablets, I compiled a list.

I thought SAP was shit until I worked with Microsoft Dynamics NAV, an ERP from alternate 1990s hell dimension. It has a built-in IDE that uses its own language called C/AL (syntactically similar to Pascal). The only source control is developers’ ability to lock files they are working on. And the code editor is worse than notepad. Seriously, it does not allow to select or paste multiple lines, and in general, acts as if each line is it’s own textbox. Forget about syntax highlighting or anything else other than black text on white background.

And, AFAIK, if your company needs to customize it, you are required to hire a “Microsoft-certified” NAV developer.