Having done some testing today I've noticed that if you have two transformers (for example MV), that transform from HV to MV and back to HV again, then you don't need 4 in parallel. The one that transforms HV to MV will each tick get a 512 EU packet from the power store and convert it into 4x128 EU packets. The transformer on the receiving end has a large enough buffer (512 EU) that it can take all four 128 EU packets each tick, so it will do that and build them together into a 512 EU packet again.
However in Bru1zers case the receiving machines do not have enough buffer to take 4x128 EU which is why such a large amount of transformers are needed.
But as long as the receiver has enough buffer it WILL be able to accept the entire batch of transformed power each tick, without having to split it up over four transformers. This is probably only the case for machines with large buffers such as energy storages, transformers, high level machines and electrical engines.
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