These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Game Breaker: in an ordinary match, you are always limited to six research project slots at any time. If you want to research something else, you have to give up already researched stuff to make room. HOWEVER, if you're Hierarchy and build a walker hardpoint granted by research, the hardpoint won't be removed once you give up its prerequisite! Therefore, it's entirely possible to finish the last campaign mission by building two Science Walkers then buying Assault Branch Suite 3 and filling one walker with Visual Enhancers (reveals the whole map) then giving up the three slots to buy Mutagenic Branch Suit 4 and filling the other walker with Cascade Reactors. Result: ability to launch radiation cascades without using a spotter, enabling you to utterly rape the defenders into oblivion.