Oh I agree (and I have done a lot of that), but that is completely different from running a game in another system IME. We borrowed ideas from other games for frequently in the firt few years of 5e until we got a system we love, but now it is pretty stable. I really only go looking if we are...
I mean, realistically I feel this statement is true for about every class and monster in D&D, heck any RPG I've ever seen. I don't think that realization gets us much.
Perhaps I missed but how is magic dependent on the Weave of Mystra? I mean she doesn't even exist in my setting! ;) Seriously though:
I don't see any reference to the Weave in the PHB Chapter 7: Spells (I didn't check every spell though).
I don't see any reference to the Weave in the Wizard...
I don't know that marketability is much of an issue. It seems to me there are lot of ways to market a new setting, including Dark Sun. Ease of design definitely could be in issue. WotC has previously not shown a lot of interesting in design settings. However, that is clearly changing.
Those...
I will disagree with that. I don't feel D&D needs psionics at all. I don't mind if people want and enjoy psionics, but it is definitely not a need for the game. If it was a need, then I don't think 5e would have done so well over the past 10+ years!
I have in the past, I just don't have the time and energy to do that now. Also, I should explain that I, and my group, have never had more fun roleplaying (over the past 35+/- years) than with our current homebrew version of 5e. So that also acts as a deterrent to exploring new systems.
I have not run into "more furries, the better" content for 5e, but, like other systems, I am would mostly gloss over those as well.
However, it is seems you misunderstood the thrust of my realization. It is a time issue for me, not a content or excitement issue. I always find new ideas exciting...
After looking through this article I just realized something about myself (and perhaps the hobby). I just gloss over the non-5e products. While I might have the time to adapt new material to my 5e game, I don't have the time or bandwidth to take on a whole new system.
I see a lot of interesting...
That is irrelevant with regard to the common trope of hand gestures, facial expressions, and other somatic components being part of psionics for a long time. You don't like them =/= bad design.
I was not talking about need to perceive the manifestation of psionic powers, that was someone else.
What is bad to you, isn't universally bad.
Look, my preference is that the only spellcasting class is the wizard and all other magic using classes use a different mechanic. But I understand that it is my preference and not testament to good or bad design. I think you might want to reflect on that.
The idea of hand gestures and psionics going together has a long history (Jedis being the obvious example). I don't think that should be an reason to scuttle this ship
I mean psionics is, like magic, completely fictional. Its concept can be whatever we, or in this case WotC, wants it to be. Heck, we don't track material components for our wizard, so I know we certainly wouldn't do it for a psion!