What it really comes down to is the question of the actual goal and the costs of reaching that goal. For a huge percentage of things "good enough" is in fact go

What it really comes down to is the question of the actual goal and the costs of reaching that goal. For a huge percentage of things "good enough" is in fact good enough. It's also important to not confuse the goal and proposed solutions for reaching that goal. For the example above, is the goal to be able to spray upside down? To ensure that the sprayer is able to spray a higher percentage of what's in the bottle? How large is that percentage improvement (90% up to 95%?), what's the incremental cost of increasing that percentage, and what is the actual worth of 5% of the contents of the bottle? A draw tube that is flexible enough to fold in half, strong enough to not kink, sturdy enough to not collapse when bursts of suction are applied, weighted enough to stay in liquid, strong enough to assemble quickly and easily, etc. is probably also expensive enough to just not be an economical solution. By the way, if you don't purchase cleaning supplies regularly you may have missed that a lot of those tubes have gone away - they're now molded as part of the bottle so just tipping the bottle will put all remaining liquid at the intake point.