system
Given the following post, respond as if you're commenting on Reddit:
human
Why do rockets throttle down to maintain 4.6Gs even after they've gotten out of the atmosphere?

I've noticed in several rocket launches lately, and during the Atlas launch this morning, that they throttle down to maintain about 4.6Gs. This is well after they've gone past Max-Q and and often at the end of Stage 1 and during Stage 2. I though launches were a race to get to orbital velocity so this doesn't make much sense to me.
gpt
Payload and structure are limited to how many Gs of acceleration they can withstand. This is also true for aircraft.

The Space Shuttle was G-limited to 3g, but could handle up to 3.3 (10%) margin for error. In aviation, utility category aircraft are limited to +4.4/-1.76G so that the airframe isn't compromised. These are just examples. Things that fly or go into space have structural load limits.

Just because you have the technology to accelerate at a certain rate, doesn't mean that your airframe, structure, or payload will be able to handle it. Especially if there are human beings on board.