If you read the skill entries (LBB1, p.17-22) the recommended bonuses for skill levels are all over the place. +1/level, +2/level, +4/level, +2/level over level-1, +1 for level 2+ are all there. If anything +2/level seems the most common (outside combat, where +1/level is universal), not 1/level, and there is no stated 'baseline' that I recall.
The thing is, that all of those exceptions are explicitly called for in the writeup of the skills themselves.
But what's the "default" setting in the absence of any explicit calls for one of those exceptions?
That fact that elsewhere bonuses scale with skill, but here it explicitly says "Medic-2 or higher..." actually supports the text meaning that there is no higher bonus with increasing skill (otherwise why state it differently from elsewhere). To claim otherwise is to claim that 'actually all skills should give +2/level, because Vacc Suit and Ship's Boat do' (sometimes)'. Some skills give large bonuses for increased levels for some things, others do not. Medical just happens to give a +1 (only) to reviving Low Berth passengers if you have Medical-2 or better.
As I stated previously (and will reiterate again) ... the "default assumption" is that skills are +/- 1 per skill level
except when explicitly explained as working a different way specified in the skill description in RAW.
The Medic-2+ skill yielding a +1 DM is not an EXCLUSIVE factor (preventing all others from applying).
Think of it as being more like an explicit enumerated bonus ... but not one that makes all others irrelevant.
To make a highly imperfect analogy (but follow the bouncing ball, here) ... that would be akin to looking at the +1 DM with a weapon for having a high DEX and then saying "because you get that +DM,
no other +DMs from any other source are allowed to apply or should even be considered" ... thereby making the +DM from DEX an "exclusive" modifier.
Player: "So if I've got Gun Combat-4, but have DEX=C ... I can only get a +1 DM, total?"
Referee: "Correct."

Player:
Granted, that's a highly imperfect analogy (because +DMs from attributes are different from skills, kinda) ... but it illustrates the trajectory of presumption that I'm wanting to highlight here, and why it's a false "choice" to make the game mechanics operate that way.
Sure. But that does not mean that it can never be made safe - just not by skill alone. Bring the low berths to a really good hospital equipped with the best equipment for revivals, and have a Medical-2 or better character oversee the revival, and it can probably be done safely, for one option.
Notice what you're "doing" with what you're saying here.
SKILL DOESN'T MATTER once you reach Medical-2.
You could have Medical-9 ... and it wouldn't make ANY DIFFERENCE whatsoever.
But if you've got a piece of tech or a drug in a hypospray ... or better yet an entire hospital building ... something that is NOT SKILL RELATED ... oh that can definitely make all the difference in the world!
I ask the assembled reading this ... does that make sense to anyone ... in general/generic?
Would you, as a Referee, apply the exact same "standard" to any other skills that way?
"You've got Forward Observer-4, but 3 of those levels are completely wasted and will never do anything for you (the only level that matters is Skill-1)."
"Computer-3 is the minimum required to write this program, but you get no +DM to success from your computer skill level."
"Mechanical-5 skill? Anything above 1 is worthless!"
... and so on and so forth.
