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On that thoguht, we should have 2 kinds of lava : Overworld lava that works like it does now and hurty, ouch, ouch Nether lava that isn't useful for anything other than pain and death.
The biggest imbalancer in this whole equation is Nether lava.
I do tend to agree on the part about lava. It would be a little bit more immersive if lava was split between the two (or least nether split from normal laval). All to often the simplest form of power is lava gen and normally its come from nether pumping. It would be immersive if the nether lava was changed to something like "Magma". "magma" cannot be used like lava currently is. It could be like an impure form of lava (or too hot if thats the design). In order to use the magma, it would require a seperate process that "refines it". This refined magma could then be used in current engines with however a reduced efficiency. It could never match up to the real lava but an imperfect alternative. Examples and I'm just gonna use made up numbers for example purpose.
1 "Lava" Bucket
Magmatic Dynamo = Produces 800,000 RF at 80 rf/t (500 Seconds)
Geothermal Generator = Produces 1,000,000 EU at 20 eu/t
Smelts 100 items in furnace
Source Blocks become Obsidian when hit with water
1 "Refined Magma" Bucket =
Magmatic Dynamo = Produces 200,000 RF at 20 rf/t (500 Seconds)
Geothermal Generator = Produces 250,000 EU at 5 eu/t
Smelts 25 items in furnace
Source Blocks become Cracked Stone when hit with water
Plus you can make the refining process take time and is slow to nerf it further or make the refinery take power. It would nerf the aspect of just use the nether to power the entire base. While yes you can anyway, it would just take more materials.
Just idea for 2 cents anyway.