Back in the early days I learned enough html 2/3/4 to do what I wanted to do with web sites, then started into adding CSS. Synced/uploaded all with Fetch. Dabbled in iWeb, Dreamweaver and something else. Took a hiatus.
Next time I looked, contemporary web sites were done with databases and much fancier than I needed and were over my head. I still have a couple of simple small informational ones done in html and when I need to modify them I can still with some html knowledge refreshing do it.
Most recently I installed WordPress and managed to learn it and do enough to set up again, a couple of simple informational sites. Maybe 2 years ago they changed the interface so drastically and introduced new panes, terminology and so on, it’s so bad I have great difficulty in making changes and learning how to use it.
Almost worse than that is finding a template. There must be thousands by now and their search feature imho is not useful. I’ve searched for, say, ‘white, clean, photo, blog’ and I get results that don’t even match that description and have to wade thru tons of results. So I gave up.
About a year ago I spent about two full days on the couch reading up on the latest html and css to create a site with mostly text, a few images, and it works ok on various sizes of displays.
Going from the concept of sites to be viewed on big computer screens with slow internet connections to now trying to build a site for viewing on that as well as small screens, fast internet, various browsers and all their tricks, is quite a change but as @Dafuki writes, simple html sites are still in 2026 valid and usable.
Anyway, ‘right tool for the job’ for OP would then seem to be to assess what is now, what the desired changes are, what audience and tech use wants/needs to be addressed and then, sounds to me like OPs friend might best grit the teeth and dive back into Elements to accomplish those changes.
According to a page at realmac, the ‘User Manual’ is not a pdf but a web page: Welcome | RapidWeaver Elements Docs
And on initial glance, doesn’t say what version is applies to, quite possibly not the Classic version but mayb still somewhat helpful, or maybe write them an email and ask if there is a pdf manual for the older version lurking somewhere. Maybe on the Wayback Machine.