Does Windows on a MacBook Air via Parallels work well for everything?

Regarding the MacBook Air: No—it works for most basic tasks like Office and web browsing, but not for CPU-heavy or graphics-intensive software. Parallels runs an ARM-compatible version of Windows, so x86 apps need emulation, which tanks performance for 3D modeling, video editing, or games. The Air’s passive cooling also causes thermal throttling under sustained loads. For lightweight apps, it’s fine; for real work or gaming, get a Windows laptop.