Just on the topic of size, because Sadurian's comment highlights something that I (as a regular player of halflings) actually see quite a lot... People frequently, almost consistently, underestimate (Or, I should say, overestimate) the size of halflings. Most people don't really mentally clock to the dimensions of a three foot, well-proportioned adult.
Here's some quick model shots for perspective:https://i.imgur.com/ikxyL9f.png
These are modes that are just barely shy of 3 feet tall, compared to models that are just barely shy of six feet tall.
Here are some more dynamic poses:
Naturally stealthy halflings are so partially because of their size compared to bigger folk. A lot of folks don't quite realise what you can do and get away with when you're this small.
Pranks, Planning and Carry Limits:https://i.imgur.com/ARs2nVE.png
Left: Some folks can't take a prank. Wren is not sorry, and has no intention of apologising; the more mature party members keep the peace and stop anyone getting strangled.
Middle: A heated debate about what the party should do next, but it seems not all voices are being heard. Bonus illustration: It's not actually impractical at all, to suppose that a halfling might effectively Hide behind a medium sized party member.
Right: I don't care what they're doing, I am not going to carry you.
Haflings aren't like nine or ten year old kids at all - nine and ten year-old humans are actually taller and more visible than them; halflings are *Small*, smaller than most people realise, in fact. Their innate racial perks make a lot more practical sense than some people think.
Sorry for the partial derail, but it's all pointing towards the support that their racial abilities, including moving through larger creatrue's spaces, should very much be preserved and put in properly.