True, you don't.
It's definitely convenient. A possible downside would be that it doesn't promote discipline; it makes it easy to drop one thing and let something else take your fancy.
If I plug my iPad into my work PC it displays a message acknowledging that it has been plugged in but warning that it isn't charging. Technically it is charging, just so slowly as to not be much use.
Conversely, plug it into an Apple laptop and it charges in much the same way as if I had plugged it into a wall socket via a power adapter so all I need to charge the device is the now nearly ubiquitous Apple 30-pin to USB cable.
There are many little touches like that; laptop power cables are connected magnetically, so someone tripping over the cable won't pull the laptop to the floor, the pulsing light that shows when a laptop is sleeping dims as the ambient light drops, so as not to be a distraction in a dark room, separately maintained volume settings dependent on whether or not headphones are plugged in (no doubt commonplace now), cordless mice (with a touch-sensitive surface) that take two AA batteries but will work with only one inserted, etc.
Little things that at first might not be noticed but over the lifetime of a product they do make a difference and are indicative of the thought that has been applied by engineers rather than accountants.
No doubt a story that made it into his biography but when motivating his staff, Steve Jobs equated reducing the boot time of the original Mac to saving lives on the basis that hundreds of thousands of people would be sitting in front of their Macs waiting for them to start-up everyday.
Though a little melodramatic, IMO he had a point; I'm fairly patient except when it comes to computers, so it's nice to know that the design has been subjected to that level of care.



) that take two AA batteries but will work with only one inserted, etc.
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). I would avoid buying any "new" technology until it's been about for at least a year as most things aren't tested well enough , the same applies to upgrading operating systems etc
