The original idea I recall for this was to send hundreds of these probes with the hope that a few might make it (because this launch method and the probes would

The original idea I recall for this was to send hundreds of these probes with the hope that a few might make it (because this launch method and the probes would be relatively cheap once you built out the laser system). But also, interstellar vacuum is very, very empty. Encountering a speck of dust even in that distance with that size of a probe is a pretty negligible risk if I recall correctly.