In all seriousness: Starfield has a variable jump height based on local gravity. Oxygen consumption differs based on encumbrance which is affected by local gravity. You can put hard numbers on that, but it should be enough to just say you'll jump higher or that you'll run faster. Are you seriously going to decide against getting the 'jumps higher' skill because the increase is only 10% as opposed to 15%? Are you even really capable of noticing a 10% decrease in oxygen consumption? So many of the skills being complained about here are real time gameplay stuff that you're not going to be calculating on the fly anyway. An improvement to weapon handling in zero g is not something that will mean anything to you in numbers, but you'll notice it when you're shooting a gun in zero g.
If you want to know the difference in jump height, save your game, jump, buy the skill, jump again. If you don't like the increase, load your save. You can start blubbering about how you can't be sure whether you'll like the effects of a skill after an hour of play but guess what! That's video games with RPG skill trees! It's not like this is Diablo 2 where you could straight up ruin a character with bad level ups lol