Why OEM bioses have so much unused strings?

Literally looking into AMIBCP and wondering.. WTF? Why in holy you need to f**king compile 3 SETTINGS for 1 device? Even if they are duplicated! Even if they do the SAME! Why just not let stock AMI ones stay in?

Literally 70% of bios strings in my bios are literally unused/duplicated..

Is this really some strategies to make BIOS as big as possible, or its just a leftover/error? Unusual to have 5 settings for same crap…