What is suggested about the engineering complexity barrier for Mars missions compared to reaching the outer planets?
Answer
It suggests a much lower overall complexity barrier
The success rate for Mars missions, even with historical setbacks, suggests a much lower overall complexity barrier when compared to the engineering needed for missions targeting the outer solar system.

Related Questions
Which planet sits atop the list for human-sent probes and robotic explorers, excluding Earth?What scientific curiosity is the primary driver for the intense focus on exploring Mars?What is the approximate duration of the synodic period for Mars that allows for frequent launch windows?How do the close-up, long-duration studies afforded by Mars orbiters and rovers contrast with encounters at the outer solar system boundary?What type of scientific question historically drove many missions to Venus?What specific record do planets like Neptune and Uranus hold, which distinguishes them from Mars's visitation count?What is suggested about the engineering complexity barrier for Mars missions compared to reaching the outer planets?According to the text, what distinction between exploration and culture is noted regarding Mars visitation?What feature of Mars makes it a prime target for astrobiological study when contrasted with Venus or Jupiter?What is a significant advantage allowed by the steady stream of missions enabled by Mars's short turnaround time?