My understanding is are being considered because people are resorting to creating unspendable UXTO's to "embed" data. This would pollute the blockchain and is not something that can be stopped, so since we can't stop it, let's at least provide a cleaner way to do it, albeit we would prefer it not be done at all.

Is this sort of the point and why this won't be a feature that will be easily provided?

Problem is, it is still way easier to do the former than it is to use OP_RETURN, from how I understand things, so unless you make it at least reasonably as easy/hard to use OP_RETURN as it is to do the former, it is sort of pointless.

But more generally, how do you even specify your own output scripts? What if you want to something fancier than just sending BTC to one or more recipients using the already-supported script operarations. How would you even do that? Is the reference bitcoin client not meant to support this?