I understand the idealogical reasons for, say, Bitcoin Cash arising as an attempt to bring transaction times and fees crashing down while increasing network capacity to the existing 'currency'. But when it cpmes to creating new currencoes on general, forking the existing blockchain just seems let yet more reward for existing holders, and further disincentive for the new coin to actually be used for anything.

I mean hell, here's another way for your rapidly inflating asset to maybe gain another 10% overnight! Why on earth would you ever spend any of it?