unless there are computational aspects to your work, which these days there usually are

But all of these ELNs are targeting replacing wet lab notebooks. I tried many ELNs and even wrote one, but I don't think there is any replacing paper notebooks for wet lab research. Even when you have some computational aspect, you can print out a figure or table and attach it to a page in the notebook.

(Now reproducible dry lab notebooks are a whole other matter)

I run a computational lab, and I still use a paper notebook

I did wet and dry work in my PhD and before, and found a paper notebook to be incredibly inconvenient. Finding things, referring to things, including data or code - all very laborious if it's even effective. I can imagine keeping thoughts or notes like this, but not my lab book.

I use monthly markdown files where I can link out to code, commits, issues, include figures etc.

I found the opposite to be true - electronic lab notebooks were almost immediately abandoned, or in one case turned into an illegible wall of madness.

To each their own I suppose.

Nothing is easier than using real paper and a pen.

But as kabdib has said many times, "You can't grep paper."

Yes. But more and more, you can easily photograph and OCR it.

Yes