Laser can be focus free
I don't know under what circumstances they can be made focus free. If you read the comments, you will see that "focus free" does not mean "no lens required".
While I find the idea of a scanning laser projector intriguing, they apparently do not come without some compromises.
You need continuous wave (CW), single mode lasers. Those are apparently more difficult to make and consequently more expensive than pulsed multimode lasers.
Single mode lasers are about 1/2 the wall plug efficiency of pulsed multimode lasers.
Single mode are the ones with the worst speckle.
Direct scanning requires an analog power modulation, which will consume more power. I don't know if there is a way to use a switching power supply or not.
I think they are also difficult to get into the correct wavelengths (particularly green).
pulsed are still so quick that your eye will never see it but I don't know if they pulse quickly enough to be used in a, say 40x dlp unit. I suspect they are.
You can confirm (or dispute, if I got it wrong) any of the above info through that Karl Guttag site I referenced above.