Thinking about the Viking landers and how they where more analog and as such could be put in a oven to heat sterilize. It might be advantageous to make landers that are simpler and more analog, leaving the complex processing to an orbiting mothership, allowing for easily sterilized surface probes.

Complex electronics are more fragile, could also maybe use brass more in it's construction, it's naturally anti-microbial, I dunno just rolling ideas around.