This is a broad question, but the premise is fairly simple: what technological advancements that we take for granted today might be lost, or might no longer be necessary for a spacefaring civilization? There are a few obvious answers that come to mind, such as firearms (which ultimately are not "necessary"), but might there be other things that could be lost, such as certain means of terrestrial transportation, or computing/communications technology, that might be done away with, and still allow said civilization to engage in regular interplanetary space travel?
Once again, I understand this is a broad question, but I'm trying to start from the ground up here, at least on a technological level. There are lots of sci-fi stories that imagine that the future will be more technologically advanced in essentially every way, but I can't help but wonder if there are things we might actually lose along the way.
Edit: In response to this question being put on hold, I will try to narrow it down a bit. I am not imagining a civilization that lives exclusively in space, as some of the answers below seem to have assumed (the answers were still insightful though, so thank you). I am instead imagining a civilization that has the technological capability to travel between planets (specifically within the same solar system, so so-called "FTL" travel is out), and has colonized those planets, with large, thriving cities and permanent societies/cultures on their surfaces. Within this context, I am wondering what technologies we take for granted today, specifically things like cars, firearms, computers, cell phones, etc., would no longer be necessary or present in such a civilization. The premise behind this question is whether or not it is realistic to imagine a spacefaring, human civilization that has advanced significantly in some technological areas (such as rocketry and space travel) but has regressed in others (automobiles, firearms, computers, etc.).
For the purpose of example, imagine such a civilization as follows: rocket-based spaceships are regularly used for interplanetary travel within the confines of a specific solar system, but: beasts of burden are used in place of automobiles on the surfaces of those planets; swords, spears, and other medieval/ancient weapons are used instead of firearms; and textiles are produced by hand rather than en-mass in factories. Is such a civilization plausible, and if so, why? If not, why?