As you can see by the responses, it basically comes down to will you have shore power? If shore power = yes, then no, generally there is no need for a generator.
Will you be boondocking/dry camping? If yes, then having a generator depends. As many have already mentioned, I also have both a small solar system { (2) 100W panels, (2) 12V grp27 batteries and a 1000W inverter } and (2) Champion 2000W Inverter generators with the parallel kit.
I will only run the generator(s) if needed so I consider them a backup. Even though they are quiet, I do not like running them as I'd MUCH rather listen to a river/stream or nature. If I need air conditioning, then yes I would need to run the generators while boondocking but I try and find reasonably cool places to boondock where air conditioning is not needed. Then you have cloudy or rainy days which might require a generator to run to recharge batteries.
Yes, I could better optimize my solar system by running (2) 6V batteries in series or better, even more batteries. More solar panels to get me to 600W +. It all comes down to the money being spent. One day I'll get there but for now, I'm satisfied.