"Worshipping" is a strong word to use. We admire and respect HackMew, and we're incredibly thankful for everything he contributed to the Pokémon hacking scene. He's one of the main people responsible for getting it as lively as it is now, so his praise is not unwarranted.
These tools are in no way obsolete. Many of his tools - XSE in particular - are staples to hacking the GBA games, and they are still fully functional today on the systems they were designed for. You just have to understand what you're getting into when you use a Mac device over a Windows device. The two experiences are quite different, but you'll often find that many hacking programs such as these are developed with Microsoft's OS in mind. This doesn't just apply to the Pokémon hacking scene, either. You'll find that it's the same with just about every other hacking community. It's getting better as Mac and Linux become more widely used, but the situation ultimately remains as it is. If you really wanted to, you could try to run these programs under Wine to see if they work. I don't know if they do myself, but it's a better decision than deriding other tool makers, hackers, and players for this explainable discrepancy in software compatibility.