I don't think a client has ever ask to see my qualifications, to be honest I don't know were they are
IMHO, being a professional, is about understanding and fulfill the clients needs,
it has little to with technology, equipment , f numbers, lenses or shutter speeds.
Being a successful professional has a lot to do with being in the right place at the right time, and delivering the goods on time and on budget
IMO it has a lot to do with all of the above. The proportions vary with each of us...
The qualifications show you have been able to learn and attained recognition of your peers etc. Nice. I keep my certificates in frames on the wall, so they don't get lost!
Understanding the tech is these days, less important, but still very much a big help and more important that many think.
As for luck (right place right time) ... without it, you are sunk. As others say, "... then make it yourself."