There is no point using SPI NOR flash chips larger than 16 MiB (128 Mbit). This is non-negligible, but might be still worth it at least to avoid the frustrated "I plugged the power but there is nothing on the monitor" support requests from inexperienced users. The prices of suitable SPI NOR flash chips seem to be around 10-20 cents on AliExpress (or even as low as only 4 cents?). The minimum amount of the required storage would be 1 MiB (8 Mbit) to fit a user friendly bootloader with some advanced features. The SPI flash can be used to store a bootable firmware on the low cost development boards, which do not offer any other kind of non-removable storage (NAND or eMMC).
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