Meaningless change here's why; a 36HP Solid eats 720 charcoal per hour in 1.5, you need 1440 as of this change. I just finished prototyping a charcoal factory that produces about 48,000 charcoal per hour consuming only 1440 of it to keep the entire system completely enclosed, it never needs any outside materials, no human maintience, nothing, I never even have to look at it ever again unlike any Liquid system thus still its still completely superior. Tldr: Under the new solid fuel values it'll cost me 2880 of 48000 charcoal instead to keep the loop running, woop... All he's doing is lagging servers more because its just going to be shuffling around 2x as many items thru networks to keep up.
Edit: Wait a minute... If charcoal was 1600 and is now nerfed to 800, planks are worth 300 and still worth 300 and you get 4 per log which is equal to 1200 its actually 50% more efficient now to just send all your logs->planks->solid boilers... Well that cuts a huge step out of the process! So I guess I now have a Plank Factory that produces 192,000 Planks per hour for solid boiler fuel and at half the MJ cost of the charcoal factory since I can just cut that entire furnace part of it out so i'm now using 3840 planks of 192,000 produced to power it. This is pro balance.