Just looking at the 3 promoted clubs summer windows last season.
Southampton:
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Leicester:
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Ipswich:
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All 3 of them did the boring 'buy English' and 'experience' thing and none of it worked. The only English signing for all 3 that was a major success was Delap for Ipswich.
You can make the case that each clubs best signing was from abroad. Fernandes for Southampton, El Khannouss for Leicester and Cajuste for Ipswich and none of them were that clubs most expensive deal. Signings like Ramsdale, Skipp and pretty much all the signings from the Championship just didn't work out.