I could be wrong BUT I'm thinking the bigger problem is not whether or not "you" should stain but what you have discussed with the framer as to the dos/donts of his job--it's YOUR biz,
you get to decide what happens(whether you are right OR wrong). That being said it is
your responsibility to get smart/educated enough to be able to make informed descisions about things.
Staining will take a little more time(perhaps as much a 5 seconds/cut???) but it will definitely help hide the less than perfect joins--especially when they show out 20 shades lighter than the surrounding finish. Even if it does fade over time(sometimes within the same day) it will still help cover up the non-finished/bare wood. Using putty(necessary at times no matter what you do/dont do) certainly takes considerably more time/effort to mix/apply/clean up from.
You are doing the right thing by polling the populace and then, making your own decisions about things based on what you read and your own gut feelings. There is, also, something to be said about deciding on something and then trying something else(or more than 1 somethings) to see if the results are any better/worse and then going with the best solution......
I infer that you are uncomfortable with things as they are, and as you don't know enough about
his job to make sound/informed decisions, then you'd best become educated really quickly so that you do know(attend a framing school-or 2?-and attempt to sweet talk a competitor into letting you hang out in the back room for a day-not an easy task!, join local PPFA and attend meeetings where you can talk shop-read that bleed 'em dry of info!, wade thru F.A.C.T.S. for info, pour thru TG history[there is a lifetime of info in the archives-you just have to figure out what works and what will work for YOU]), & get you framer to teach you everything HE knows about the craft.
Your work is cut out for you....
