That's why I have one of these in my laptop bag.
Not to mention I know if it gets knocked around abit while running I don't have to worry about a hard drive head crash!
But to each his own!
Very true about the durability thing. I make a lot of videos, and one thing that worries me is bumping the thing around too much and losing my work. I could go with a single SSD and a 1 TB HDD, but a marathon Fraps run will still chew through the one HDD like a fat kid in a candy shop. I don't think USB 2.0 transfer speed will be an issue if I render the finished video directly to an external drive though. Just gotta not be lazy.
For me personally, the mobility aspect of a laptop isn't the weight alone, but doing away with extra clutter. I can deal with a heavy laptop, but setting up and putting away external devices and such costs time (and is quite annoying when I need the bathroom), and there's also the chance of actually leaving behind something if I'm in a hurry. For these reasons, my next lappy certainly won't be one that relies on a single SSD for internal storage.
Heck, I even modified my case to hold the power adapter while it's in use, and easily wind the cables back inside. Adds more weight, sure, but again, less clutter to deal with. And with modern graphics switching, battery life, even on fatty gaming laptops don't have to suck (thank god).
Agreed, to each his own. One thing I did like doing was building desktops for my friends. There are reasons I went for a laptop though, and for me, the pros outweigh the cons. Definitely not the story for everyone, but that's what options are for. One thing that does make me facepalm though is someone buying a gaming laptop, and then confining it to the desk for it's whole life. Waste of mobility, and money.