Laser Soldering by nature is a very dialed in process. - Requiring specially formulated flux and solder paste applications that will perform while absorbing a massive amount of energy.
What I believe "Gary" is attempting to say is: Laser Soldering can be a very unforgiving process in terms of flexibility.
Let's take a look at the application: If the pin to pad ratio is determined, how much space or real estate sits between the pin to ID of pad? If any space exists, a laser will shoot right through melting any components, plastic, or other critical items behind / underneath.
Additionally, as mentioned, because the laser is focusing such a large amount of energy to a single area - users will need to realize the cost for formulated materials that properly suit the application. (eg. If flux is not properly spec'd, it will burn off before it has a chance to perform. Second, if solder paste is used, the laser must be dialed in properly as to avoid simply blowing the paste off the pad.)
If using Flux Cored Solder Wire: Integrated Perforation Solder feeders should be at the top of the list for any automated soldering solution as they allow the "out-gassing" of the flux-core to release quicker and more efficiently - aiding in the reduction of solder ball and flux splatter defects.
For high volume applications, a single laser machine can perform very well.
However, for users requiring frequent change-over of processes, head angles, and materials (leaded to lead-free) users can see more "Bang for buck" on more affordable table-top hot iron robotic soldering systems. Where (for the cost of 1 laser system) users can interface with multiple different systems set-up for different applications.
(May also want to consider the time and cost of purging systems, such as a selective solder machine for example - where many of the materials being removed to change the process over are ultimately lost as scrap. eg. solder/nitrogen)
I don't think anyone would argue ,laser soldering is great when it's set-up and running as it should.
However in terms of overall flexibility and environments that call for high amounts of change-over I would look for performance and flexibility vs. price.
Note* Some in-line hot iron solutions exist that offer you the best of both worlds.
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