Reply to Reusing samples, synths, in production

So here's a problem that I've encountered as a producer: If I find a particular synth setting that I've made and like, or if I find a particular sample that I like, is it acceptable to use it in more than one song?

Here's an explanation of that question. Let's say I made a really tight setting in a soft synth. For the sake of the discussion, let's also say that it's a lead, sawtooth sound, that is predominant in the song. Now, if I make a song using this setting, is it acceptable to use that same setting again in a future production? (Assuming, of course, that the new production does not have a similar melody.)

Now, I'm not looking for an answer that is "who cares if it acceptable or not? do what you want." Because- obviously- I know that I can do what I want. All I'm saying is don't you believe it would be a bit boring if you bought a CD and all of the songs used the same synth sound?

I guess this problem digs deeper into something I've been wondering about for a while. Guitar players, realistically, use the same (or very similar) sound on all of their recordings. However, if an EDM producer did this, it probably wouldn't be accepted very well.

It almost seems to be that producers are obligated to come up with new sounds on every release. I understand that's part of the job, but going back to my guitar comparison, the sound of a guitar isn't dramatically changed on every album a band makes.

Sorry for being long winded. I'm just interested in what people have to say.