Most wireless chips work right out of the box, and the few that don't usually just need the right firmware blob to be installed (a lot of firmware can't be provided by distros due to licensing conflicts, so you have to download the Windows/OS X drivers from the manufacturer and use a tool to extract the blob from them). I guess that can be a problem for new users, but anyone who is intelligent enough to use Google should be able to figure it out. The only real compatibility issues are with new graphics cards, and that's usually only if you're using the open sourced drivers instead of the proprietary ones from the manufacturer (for e.g., the open source Radeon stack still struggles with Northern Islands/HD6xxx cards, let alone Southern Islands/HD7xxx ones).