It'll just start the dig no dig
argument debate again on here.
It depends on your soil and what manure/compost you can actually get without spending a lot of money.
I'll just say, as I always do, that for me, my back and my bank balance - moving enough compost to put a nice layer on the beds (10cm suggested here p.a.) is much harder on my back than the gentle forking over that I do at present
and would cost much more, as there's no free manure available around here
I've always added as much compost as I can, so I'm not disputing the worth of doing so.
Anyone who wants to try 'no-dig' really should visit Charles Dowding's website