i'm surprised no one has mentioned the allen/phillips combo bolts. i've never had them, i assume they're expensive or something. i don't really care.
i just have to say, i'm not really triggered by anything on slap, but seeing all the proponents of phillips bolts is vibing me out.
i thought allen was kind of a standard.
combihead is the best. indy made combihead hardware for a while. i would buy nothing else. it looks kinda cool, too. sadly i can't find any combihead bolts in 7/8 anymore. it's sick since if you happen to strip the allen thread, you can still get your trucks off via the philips thread and they still look consistent. makes the bolts last virtually forever. i lost all mine when i thought i could use a fresh set of bolts with a christmas complete, put them away and now i have like three left.
i'm surprised combi isn't the standard tbh. but it might be actually expensive as you said, since i imagine you'd have to machine two times instead of once and it probably has a bigger failure margin so less come out of qc, if they even really do that when producing those in bulk.
this brings to mind how almost half the time i buy bolts, there's either a bolt or a nut missing. if you're lucky there's too much in it. or the allen key thing is missing. independent was notorious for this in one of the shops i worked at. i would actually insist on opening each pack and counting the bolts and nuts to ensure the set was complete if someone just wanted some hardware to take home to set up their board.