The great thing about webflow is the CMS.
I design from the content out. So even if I don’t receive the ‘final’ content from the client (I work mostly for universities and academic institutions) I will have a pretty good idea from them what type of information has to go where, so I will break that down accordingly in the CMS. This forces/encourages them to fill in all the sections and full keep the site current with relevent content. If any section that I have added proves superfluous, then I can just remove it.
When I first present anything, I never use latin/placeholder text. I do think as a designer you should have a good enough idea of how you imagine the site content to be that you can at least write something along the lines of what you expect them to provide. After doing this a few times you do get a feel for it.
Sometimes that written content might actually be used. I don’t have an extra charge for copy though - I don’t consider myself qualified to do that - its just part of my design process.
When I get client content (written by them), It won’t necessarily be in the right order, or as I had broken it down. So I may break it down and use it slightly differently (say divide a large paragraph into a intro/smaller paras, add subheads, quotes etc - just so they can get a better idea. Of course it may work the other way around, and what they send makes me realise I need to adjust my design a little.
So I deliver a fully populated site, along with a CMS guide I make as a pdf. From then on its up to them, although I am of course always happy to be there for them if required.
As a one man band I do need to be able to put my hand to writing. It makes designing far more enjoyable and meaningful. I used to work for a huge corporate design firm in Amsterdam - It was all guidelines and templates, so I rarely got to deal with actual content which I really missed - and I think that separation can lead to soulless, vacuous design solutions.
Much happier now - webflow all the way!