For recent drives, if you're lucky the vendor has implemented the Preferred Write Alignment, Preferred Write Granularity, and corresponding Deallocate alignment

For recent drives, if you're lucky the vendor has implemented the Preferred Write Alignment, Preferred Write Granularity, and corresponding Deallocate alignment and granularity reports, added in NVMe 1.4 (2019). Those values may not exactly correspond to the underlying NAND page and erase block sizes, but can probably be taken at face value for their intended purpose if the drive actually reports values larger than 4kB. Otherwise, finding that kind of low-level NAND specifications often comes down to trawling through TechInsights teardowns and conference proceedings (especially ISSCC, though what gets presented doesn't always match what goes into mass production). A zoned-like workload that is append-only within large chunks and uses a Deallocate (Trim) or Write Zeros command to clear chunks should perform well even on standard SSDs. I don't think the exact zone size has much impact, as long as it's comfortably above the erase block size.