I can tell now based on the work I done so far, the IDMUs have been removed from few DCs and I successfully upgraded those DCs from 2012R2 to 2019, the Unix attributes are still there in 2019 DC because RFC2307 is still being supported by server2019. Only thing I dont know what could happen is after I remove the last NIS master server. not sure if that could cause issue. but like @MichaelHampton mentioned about, it could be just as "NIS domain" disappears, no effect to authentication. it is hard to take the risk to JUST test it in our production tho lol......
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