The visual cues I'm refering to are specific and necessary movements/actions that have to be done to accomlish any sleight. For example, the momentary diagonal position of the packets of cards in a push-through shuffle, or that ominous right hand cover and quick wrist motions that almost always accompany any pass. Anybody who knows what to look for will find it; he/she does not necessarily have to see the sleight, but only its accompanying visual cues.
Some magicians who are presented with this problem deal with it by refining their techniques to a level that greatly decreases its visual cue while retaining its deceptiveness. Others ignore it thinking that only other magicians will be able to understand these visual cues, and the last of them decide that complete eradication of these visual cues are impossible and no matter how refined a sleight is, a person who knows what to look for WILL see it. So they rely on misdirection.
The problem with the first group is that not all magicians have the ability, commitment, or simply time to refine their techniques in such a meticulous manner, and as I mentioned before, the visual cues will still be there.
The problem with the second goup of magicians is that they are using the supposed exclusivity of magic and its secrets as an excuse to be apathetic and lazy. Furthermore dissemination of magic and its secrets at this point is at an all time high, what with media magicians generating so much interest in magic and online shops and of course the lousy magicians that give themselves away. So it is impossible to assume that only other magicians will catch you if you're being sloppy or just not careful.
The third group of magicians have the right mindset, but over-reliance on misdirection may lead to sloppy technique, and even if it doesn't, even if the magician is a mixture of the first and third group (a very good mixture actually), my problem is that people will still be able to 'figure you out' if they didn't get misdirected for some or other reason and see through you're 'perfect sleight'.
Some might think at this point that this is going too far, we're not immortal or perfect, and we cannot fool everyone... so why worry so much about some obscure time when some misc. guy accidentally over-looks you're misdirection and sees through you're technique?
The answer is simple: it is precisely because we are not perfect. Therefore if we strive for perfection, we will fall just short of it - which is in Slydini's words, " better than nothing".
Then begs the question: 'how do we strive for perfection?' or a more specific question:

"HOW DO SINGAPOREAN MAGICIANS STRIVE FOR PERFECTION?"

Nice post. Well, Its very right to say that. Thats why in the end, when u performed alot, you will be tend to notice what are the different reactions you have with different audience using the above 3 grps.

I will say, none is good, none is bad, you juz have to use the sleights different, which is why different sleights are created, though we cannot master all of them.

It really beats down to during the situation, observe the audience's reaction to your movement, as you justify your moves, if they are still suspicious about it, normally, its not because you are not good in it, they just know its trick!! So go around it and do something else. Performing the same results using different ways breaks down and decrease their thinking of how it was done.

I guess perfection comes with experience.

Agree about the visual cues though. Spectators do note that the magician has done "something" but they can't exactly point it out, since.. they don't really know what the magician is doing in the 1st place. argh~~

*scatters off to practise*

Skill is important, but it does not necessarily mean technical skill alone, but also attention control (or misdirection) skill.

Even the most technically experienced person need some attention control if not to cover for any "visual cues", then at least to make the magic enjoyable for the audience by making them focus on what is important. Of course, they're reliance on these other skills is only diminished in the technical sense, but nonetheless, routining, entertainment and other audience skills are still equally important.