There's a huge difference between the occasional company getting the occasional boost when some individual lawmaker or a small group of them can finagle something good for a company compared to every single lawmaker being aligned and wanting certain companies that they all agree on to succeed over others purely because it's beneficial for them and not necessarily because the market views them as better or the general public benefits.

A free market is a system that's based on emergent behavior. As we see time and time again, even the best and most useful and narrowly focused regulations that are beneficial when first implemented need constant review to make sure they aren't later doing more harm than good. Carving out a big chunk of the market as likely to get special behavior regardless of the normal inputs and outputs could outright be disastrous, IMO.