Tony Vargas
Legend
The slow-down is only in the case of a group of PCs being attacked by an AE. When a PC makes an AE, the time it takes the DM to fairly roll all the saves out in the open, vs the PC rolling to hit, is about the same.If you roll against each target separately, you have potentially slowed combat down quite a bit just to more fairly determine the outcome of the effect.
That's the real issue. It'd be simpler to consolidate all attacks to one mechanic - when the game was designed. As an after-market mod, it's complicated to implement, because the game has already been complicated by coping as best it can with the redundant/inverted resolution sub-systems. Untangling that could be more trouble than the benefit is worth.2. Class and game mechanics that interact with saving throws would need to be adjusted
'When possible' is 'always:' PC looks for a hiden enemy, player rolls perception. PC hides from an enemy searching for him, player rolls stealth. PC attacks an enemy, player rolls to hit. Enemy attack the PC, player rolls to dodge/parry. PC casts at an enemy, player rolls to overcome resistance. Enemy casts at PC, player rolls a save.3. It generally is more fun for players if they are the ones rolling dice, when possible.
Someone even older can correct me if I'm wrong, but I got the impression it was a wargaming term that pre-dated D&D, possibly it was in Chainmail, possibly Chainmail adopted it from general usage in that hobby. :shrug:Now the name itself is bizarre.
Why call it a throw instead of a saving roll?
Yes. But there's a time-efficiency in letting every player roll their save all at once, they roll, you tell them the DC and effects of failed vs successful save. It's quicker. Of course, you have to trust them.Don't they have to do that anyway?
Attacks require looking at numbers and damage tracking.

The efficiency argument isn't an argument for saves, but it is one for players-always-roll. FWIW. (I swear, BTW, I'm not shilling that variant, it's just that people keep talking up advantages it presents).