It should gives impetus to further (and more targeted) effort - e.g., the killer evidence would be some kinda fossil, but what mechanisms of fossilisation would

It should gives impetus to further (and more targeted) effort - e.g., the killer evidence would be some kinda fossil, but what mechanisms of fossilisation would we expect to have existed on Mars? Perhaps stromatolites? We're still working out how to identify abiogenic stromatolites from biogenic ones. And where should we look? It's kinda hard to build a robot that can replicate a sunburned human wandering around hitting rocks with a pickaxe and looking thoughtful, and likewise, a probe that can take a core sample of a former lakebed is a very specialised probe, if it's even possible to build one that could drill deep enough to where any postulated evidence of life might be found.