Yes but usually PCs are NEVER moved or touched. Consoles can be moved, they are in cabinants, etc. Imagine if one of those tubes are damaged and/or overheated and melt. It would ruin the entire machine.
And you talk about dust accumulation. No gamer should ever have to "service" his console like a PC.
again, fully enclosed loop systems like the Corsair H series don't need any services they can be moved without problems, you can swig them around like nunchucks and they won't break. so that's not a problem.
but an enclosed system would bump the price by probably 50-100 for no good reason, both for costs of the system and because it's slightly more work to install them.
but moving the box and damaged tubes isn't a problem, price is.
Also, you have to vacuum the intakes on your consoles just like any PC.