Is there a problem using 6 sided dice in pen and paper games?

[Amentep]

D4s seem just like a way to help sell dice sets. Just toss them in a river and pair up numbers on your D8s.

 

D4s are for DMs to make a quick escape after a TPK.  Toss a bunch of D4s on the ground so they act as caltrops on the other players while making an escape.

[Deadly_Nightshade]

Fate, FUDGE

 

I'm not sure I'd really count a FUDGE and Fate as d6 systems, you can a use regular d6 with them in a pinch but they're designed to be used with custom dice.

[GetMagnaCarter]

dungeons and dragons was designed to use 20-sided dice and 2 10-sided dice for percentages (in addition to regular 6-sided dice)

but at the time they could only be bought in sets with 4-sided dice, 8 sided-dice and 12-sided dice

so, in order to justify players buying the whole set and not ending up with useless dice, Dave Arneson created rules using all the different varieties of dice

[Bluenose]

 

Fate, FUDGE

 

I'm not sure I'd really count a FUDGE and Fate as d6 systems, you can a use regular d6 with them in a pinch but they're designed to be used with custom dice.

 

I've never used anything but normal d6 for Fate, and I don't think I've ever seen the custom variety in use. It's pretty trivial for 1/2 to be -1, 3/4 to be 0, and 5/6 to be +1. 

 

I don't think anyone has mentioned it yet, but good old Tunnels & Trolls has never used anything but d6 - sometimes great bucketloads of them, but still d6.