Ships better have inertialess drives or the crew is jelly on the wall.
Ships can still have rocket drives (chuckles) if the ship itself has Star Trek style inertial dampers. The entire ship becomes a single quantum object, and pushing on any part of it pushes on all of it.
I’m more inclined to say that the glowie bits in the back represent some kind of field effect exhaust. It’s not the propulsive force, but rather a glow from venting some drive byproduct.
If ships have inertialess drives that affect everything within M meters of the drive, and the effect propagates (if I’m within M meters of the drive and you’re within M meters of me, you’re affected), then moving near a large mass not already affected by a drive would cause a sudden shock to the drive. The larger the shock, the greater the potential for damage.
Entering an atmosphere would immediately shock the drive into next week. Landing on an airless world would do the same. (Humorously, ships flying through a planetary ring would end up toting around a whole mess of debris that got within M meters of the ship)
So why not just float down to within a couple millimeters of an airless planet’s surface and then turn off the drive? Because the M value above is much larger than that. So now the capital has to be dropped from M meters onto something that catches it. Or the ship itself has some more conventional means of dealing with the drop. Small ships, maybe. Large ships, no.
Ugh. Inertial dampers could catch pretty much anything. So no inertial dampers. But if there are no rockets, we don’t need them. The drive ‘field’ takes care of the inertia aspect, and we’re turning that off in order to avoid damaging it, so we’re back to falling. No capital landings.
In contrast, a capital can coast up to a space station, switch off the drive at beyond M meters, then the station can extend an M meter long docking port.
Remember: a unique fiction can always be manufactured for any unique situation. A landing is a unique situation, so some unique trait of landings can be leveraged to make the fiction work. Either way. Landing or no landing.
As @Lomsor says, go back to the board game level and focus on gameplay. The fiction will work itself out.