It's a desktop. Use an external disk. Much cheaper.
For example: https://www.amazon.com/dp/B08S47KBMC/
We really are living in the future if people are using these words in combination.
Though compared to this new mini a lot will feel clunky. Any HDD enclosure is certainly larger.
There is a reason for the popularity of those enclosure/hub combos that have the same footprint and color as the Mini.
I can't imagine anyone but Apple shareholders drooling at the taught of overpriced soldered memory would prefer a smaller Mac Mini case if ~0.5" more height would get you M.2 bays for storage.
[1] https://eshop.macsales.com/shop/external-drives/owc-ministac...