Have to take the loot tables into consideration as not all items have the same rates across all contents. Which means specific rdr values will likely determine how often you get something from said quest.
Also, there’s the understanding of how drop works too. Weapons will always be favored compared to units, so you will see more weapons dropped than units with boosts for rdr up. Rdr also boosts the quantity of how many items can be dropped based on the enemy.
So when it comes to the atlas weapon farming, you have to consider how often that particular mob spawn and that the weapons themselves have exceptionally very low rates to start with that higher rdr will only make 10* or so more common as drops than say a jutus or schvelle dropping for you. I’m not claiming that higher rdr is bad as more rdr = more drops (depending on the enemy) but giving an insight as to better manage for those who want to better manage their boosters.
Golems innately have higher drop rate for their monster series and are a more common boss spawn, so it’s not surprising as to why golem harmonizers are so common. There’s the golem sword but that tends to be less common compared to the harmonizer for their general loot table.
Edit: also wanted to add that high rdr doesn’t exactly guarantee a high rarity drop, it just gives you more chances at getting one by increasing amount drop since the boost to the base item you’d want is probably abysmally low because we’re talking about specific weapons/units of higher rarity being possibly 0.5% chance of being dropped for each. (An example, not that they are set at this value)