I think so. Some cats do fine with lower levels, but it was the advice here about her dull coat that sent me on a search for a dry food with high enough levels for her. I guess it depends on every cat and type of coat/skin. Astrid has a problem with hairballs (semi-long hair very fine silky fur) even with brushing, laxatone and the furminator, so keeping her on higher levels of fatty acids seems to help alot. She has much fewer episodes and further apart.
As long as I check the labels carefully (I did alot online since it is hard to do it right in stores sometime) I finally found a formula of dry food she will eat and has the necessary nutrients. The final version (as of now) is Nutro Gourment Classics Hairball Control (for obvious reasons), California Natural(simple and healthy) and Pet Promise (also health and she loves it). And another consideration for me was kibble size - she has a tendency to swallow her food whole and isn't a good cruncher (unless it is a toy and that is another thread
) so I was checking to make sure she would be able to eat it properly.
It is all about the individual cat and there are many opinions (all helpful) and doing the best you can. Your cat will let you know what they like and you just have to make sure it is the best food you can find and afford.