I would recommend they follow the full installation guide instead, which is probably one of the best pieces of technical documentation in existence at the moment. The amount of detail, context, and instruction provides both an invaluable learning experience and introduction to Linux.

archinstall is not foolproof; that’s why I wouldn’t recommend it to an absolute beginner. IMHO, It’s more valuable for people who are familiar with the process and want a shortcut.

As great as archinstall is, it can’t possibly account for every contingency. Troubleshooting a bootloader issue, for example, is easy if you’ve installed one before. If a noob managed to navigate the TUI (with all of the confusing questions and settings) and complete the installation only to have something go wrong there, they’re off it, maybe for good.