Within the gtadditions.cfg these are set to false. Was there a specific reason that these machines were disabled?

One benefit is that when setting up a 100% ore processing line (available in IV for 14% byproduct ores), players don't have to worry about setting up an EV transformer because the highest tier their ore washing and thermal centrifuge can be is EV. In addition, these are usually the slowest machines in any given ore processing and stand the most to benefit from overclocked durations.

done