I haven't used a LLM to help code in a while (yes I've tried), but I found them useful for repetitive configs, like asset files. Also sometimes it makes sense to just have 5 slightly different lines of code in a row instead of a new function.

In general though, reasonable use of DRY is a good idea. There will still be repetitive parts though where a LLM autocompleter lets you just hit tab 5 times.