Von Gruff, valid questions
Reed "points" got many uses after you made them with your pocket knife in this case eg spear/,arrow points and even some traps.
So, reed products can be used with your steel knife, depending on your situation, location and intended use.
Secondly, without a steel blade its more difficult to work with a hard reed for sure, but by rubbing the reed against a suitable stone or rock, it can be shaped into a cutting blade as well.
Thirdly, without a steel blade or rock availabe, it become increasingly more difficult to use reed ,but still not impossible.
For a reed knife to skin and butcher an animal, you actually need omly very thin strips of labout finger breath lenghwise broken reed. The reed can be beaten on the ground till it split, or broken in the fork of a tree etc.
Palm lenght splinters on avarage is ideal. Care must be taken though, as the splinters will mostly be double edged and very sharp. So the "handle" part had to be made blunt to hold on to.
Also, as the trigger finger will be used to push down on the blade for better control during skinning and cutting, ,tthat part of the reed must also be dulled.
So one of the biggest problems with a reed blade is NOT so much to sharpen it, but to blunt part of it so you dont cut/hurt yourself while using it!
Reed and even more so bamboo are excellent resources to learn and utelize in nature for blade related purposes apart from their many other uses.
I used my pocket knife in these small projects , just to tinker a bit.
On youtube a guy used a single reed/bamboo stem and after crushing it, on the ground got enough "blades" out of that single stem to process a thick skinned 5 ft crocodile!
The blades are sharp enough and when they became dull, some fiber /hair can also be pulled lenghthwise from the cutting edge to sharpen it again, or it can just be swapped for a fresh piece of reed slinter .
So to answer your question, yes, reed can be utelized without a steel blade, though it will be difficult, thats why it pays to "play" with one from time to time just to get the hang of it.
I am sure there are many more knowledgable friends here that can give more advice.