I think it falls into a category or at least something that is used and carried for a period of time or at least works into a rotation.
My EDC kit usually includes an OTF Microtech, a Leatherman multitool, and a set of knuckles "for luck

).
Depending on the situation, that can change. However, day to day work attire, I pack a Leatherman P4 that has probably not been in my pocket less than 10 days over the past 2 years, and my EDC knife of the last 4 or 5 months has been a fully serrated Combat Troodon with a tanto point

Great for rope at work.
However, I'm going over to my dad's today for Christmas. Family tradition is goofy loungewear (no pockets on mine), and I don't see the need to pack much of anything. The knuckles, the MT, and the Combat Troodon are being left at home...they'd weigh down my sweat pants even if I had a belt

My EDC alternative for this a simple Ultratech clipped inside my waistband. Light, small, and more than enough to cut the copious amount of ribbon my daughter's gifts might have on them. It is a knife that I could easily carry as an EDC, but I prefer a bit more versatility for work or walking around town.
In short, EDC for me is more like selecting shoes/boots than a religious dogmatic carry. Case in point, I own three pair of work boots. One of the three gets put on 7 days a week. I have a pair of slip on boots for general office wear because they are comfortable and look nice enough for going on sales calls. I have a pair or lace up high tops for when I am out on the job and need more support. I have a pair of low top hiking boots for when I am going to be on my feet all day or off over the weekend. All three I would consider "daily" even if I dunno which ones I'll be putting on.