I'd like to shake your hand, smile, and say "Hey, I was you once!
Merry Fucking Christmas!"

Until you can read that previous sentence without wanting to slap me, I'd caution you against remarks like someone's work is a waste of disk space. It makes you come off as someone saying "me me meeeee and who cares what others want!"
There are possibly hundreds of aspects of this fetish that I wouldn't find interesting yet you would, and vice versa. I'm sure a few ideas that neither of us have even considered are going to present themselves on this site, and it wouldn't surprise me if some of these early flash teases will spark it all off.
There is rarely... arguably never... a new idea. Most of the time, what we think of as new ideas are packaging a few ideas and pieces of knowledge in a new way. Translated: It's really hard to build something really really awesome when you haven't seen a lot of awesome before, and this flash stuff is new to most.
Yes, some of the features feel forced/akward right now, as I'd have predicted, the way some people over-use any technology at first (e.g. IM) even when in some cases the previous ways (e.g. phone or email) might remain much more appropriate. Often this isn't a way of showing off, or poor judgment, it's about intentionally trying it out and learning where it fits. Wanting to take this new toy away because you want to force tease authors to use a different way regardless of what
they want is, well, probably even more insulting than you meant it.
Also, keep in mind that the Nyx help hasn't been fleshed out and published yet too, so the number of people who
- have even heard of milovana.com AND
- have enough raw data to really push Nyx AND
- have programming skill AND
- have writing skill for a great tease AND
- are the type to use the tool to tell a great story rather than the opposite AND
- have the time AND
- want to do it
... is maybe even as small as you think it is. ... so far, anyway.
Off the top of my head... things that can be done with Nyx today that haven't been explored fully if at all:
- Asking "Do you have a shoelace?" or any other questions like "have you been here before?" and then adjust the tease accordingly.
- Several (i.e. more than two) outcomes, or other use of the random function (rather than clicking buttons) to affect the plot.
- Writing the tease to notice when you're cheating and going through the motions.
- A hello page that says "Note from the author: Require x, y, z, and you may want to skip this tease."
- A hello page that gives various "jump" points, like a DVD, so you start from the beginning or just skip to your favorite scenes.
That's just with today's mostly undocumented features. Keep in mind that most of the upcoming features will add new
dimensions, rather than merely extend it, since authors will be able to mix and match in ways that even Seraph0x might not expect.
And all of it might serve to make the non-flash teases even better than they are, in the same way that learning other languages can make you better at your primary language.
So rejoice, have patience, and again I say
Merry Fucking Christmas, even if a day or two late.
(note: link contains South Park satire of intolerance)