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Is there a hardware restraint for why he chose just 1TB?

I'm seeing 2TB/4TB/8TB Nand Flash being sold online (the latter for a hefty ~$650). Is there anything stopping me from paying a professional like this to install an 8TB unit?

edit: I see those NAND flash models are supported by Macbooks. Perhaps I am mistaken in thinking an iPhone could support it.

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Maybe it's a BIOS/firmware thing: replacing the RAM memory chips on a Steam Deck to 32GB total requires BIOS tweaks to recognize the chips. I assume in this case the motherboard may be trained to recognize up to 1TB, like the highest capacity model sold. 2TB+ may be too high density to "just work" out of the box.

Could you provide a link to 4TB in a single chip though? 2TB chips started appearing only this summer...

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