Redstone should be added, it's literally in the name Red STONE. Redstone is eaten up MASSIVELY by all kinds of Vehicles like Dreadnoughts, Corvettes, Zeppelins, Tanks, Planes, Trucks, Etc. Every Vehicle uses Redstone Blocks, and it all goes to waste so fast.
Honestly, yes you have a point that its used a lot. But it seem to be a pattern where everything that is hard or needs a bit effort to get, the immediate solution is the igneous machine, might as well add diamonds and concrete in the machine cause reason is *they are used a lot*.
Why not just add another recipe of getting them, for example if you need quartz just produce flint then pressure chamber to produce quartz (4 flint to 1 quartz), why not add something like that, besides adding more stuff into this automated machine.
The only problem i see in the machine is that it forces everyone just to do a afk or waiting game on your resources, that its so easy to get might as well not mine or do other *minecraft* stuff. Redstone becoming harder to get is quite good economic trade.