I did see this but eventually the oil will go so that barrier isn't there anymore no?
I still grease my girls hair or spray something in their hair everyday and haven't had any issues
I use the mini bands in the link they don’t cause breakage they are quite small https://www.ebay.co.uk/itm/334177896074?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=s-wQHBDRQg-&sssrc=4429486&ssuid=4_rayszdrna&var=&widget_ver=artemis&media=COPY
If you cover the band's in coconut oil before putting in the hair it's fine imo