Your IDE either uses an LSP or has its own baked-in proprietary version of a LSP. Nobody, and I mean nobody, working on real projects is "raw dawgin" a text file.
Most modern IDE's support smart auto-complete, a form of AI assistance, and most people use that at a minimum. Further, most IDE's do support advanced AI assisted auto-complete via copilot, codex, Claude or a plethora of other options - and many (or most) use them to save time writing and refactoring predictable, repetitive portions of their code.
Not doing so is like forgoing wheels on your car because technically you can just slide it upon the ground.
The only people I've seen in the situation you've described are students at university learning their first language...