Snip.

With a 700 you can do big or little projects, with a 500 you are limited to little ones.   

By "big" I suppose you mean entrance doors, outdoor benches for a party of 10 or more, and balconies, and "little" anything else.

Yes, single tenon joinery made with the DF500 may not be strong enough for certain structural elements, but it's more than fine for typical cabinets and furniture that most woodworkers build. Let's not forget that before the DF700 came to the market, woodworkers had been and are still building tables, chairs, beds, ladders and whatnot with its smaller cousin.

Something not every DF500 owner is aware of or tries is the double, twin, and double/twin joints which are very strong. Elsewhere in this Forum, I've shared them. My dining table for 8, breakfast table, credenza (its contents are books and magazines - some 400 of them?), set of 6 dining chairs, etc. are all in good shape after 1 to 5 years of use, and they were all built with the DF500.

I had this debate years ago and I ended up getting the 700 plus the Seneca adapters for 5 and 6mm. I found myself using only 5, 6 and 8mm cutters so now my 700 is for sale (or trade locally).
I think the idea that the 700 can do everything that the 500 can do and much more is true but it’s heavy and I think I would prefer the lighter 500. Time will tell, maybe after I switch to 500 I decide to go back or worse, get both of them. So it’s life in the conquest for the perfect tool lineup. Now I’m tempted to try the Lamello Zeta P2 plus the 500 if budget will allow, probably totally overkill for small house projects I do.