This reminds me of the current omnigenic hypothesis about genes. That unexpectedly almost every gene seems to affect the expression of traits.

https://www.quantamagazine.org/omnigenic-model-suggests-that...

"Drawing on GWAS analyses of three diseases, they concluded that in the cell types that are relevant to a disease, it appears that not 15, not 100, but essentially all genes contribute to the condition. The authors suggested that for some traits, “multiple” loci could mean more than 100,000."