Is this latest exchange between Darvin and Tinker on Goblins about them in some specific context, or just in general?
If it's in general - mo' decisions mo' opportunities. Goblin racial power recharges bars, you pair it with sources of bar extenders and blob all over the dungeon. Otherwise, they let you either skip the very early navigation challenges almost entirelly (or avoid specific debuffs) and they let you get levels with fewer kills, meaning you need less exploration. This last bit is antithetical to the philosphy that leads certain stubborn point-chasing newbies to misevaluate how much effort/power is actually needed to kill a boss, and it also lets you fight bossess sooner than you otherwise would (less need to comb the dungeon for the big cash-in moves and good kills are harder to find than good tools).
Haflings are similar, except folks either understand them and don't talk about it much, or don't and lump them with gnomes (and them and gnomes play differently).
People also suffer from "hoard everything for bossfight" mentality. It's not that it's not wise, it's just that at some point they loose sight of how much the quality of the items, preps, glyphs and the availablity of gods (as well as their playskill) has lowered the need to hoard and increased the opportunity to cash in on moves earlier.
One of the most silly broken strategies ever (back in the day) involved dumping all your potions from square 1 and fighting stuff way above your level. Anyone who's had the good fortune to play the game and see how that plays out has also seen the benefits of explosive starts via consumable resources (first fight dodge + reflex + STR was default start once upon a time, they even lowered the initial potion prep limit to 4 instead of 5 because of this). Goblins and Halflings can easily replicate this (as cheap health boosts are everywhere). What they get out of it isn't as powerful as the old shennanigans - but all the monsters have been nerfed since than, and the principle is still there.
It's not the only thing about goblins and halflings, to be sure, but there's just way more to them (and the game) than just going "they don't have stacking bonuses, meh, meh, meh".
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I wrote some unkind remarks about Tinker here. Went to bed, couldn't sleep, came back to wipe them off. Only reason I logged in to check on this place was that I was cleaning up the old computer I used to play DD on and found a rather long and nice explanation of why there's actual death in the game I wrote at some point. I just felt so bad when I saw this discussion - so much time and it looked like 0 progress whatsoever. I expanded my post a bit instead, I hope noone minds.