Okay one last attempt here.

Channeler has strength 75, but we know a person can draw an amount beyond their maximum up to the point where they burnout and die. For the sake of argument let's assume that number is 80. If someone can draw more than this much above their maximum it would seem odd given how many times we've heard about the dangers of overdrawing.

If an angreal is additive it gives an additional strength of 100 (for simplicity sake) meaning the channeler in question can draw 175 very safely. But the angreal prevents the channeler from drawing beyond this, in other words it has a buffer. If the angreal has no buffer our channeler can pull in more power up to 180 before they burnout and die. The angreal can't offer more than 100 but the channeler still can't draw in beyond their physical limitations.

However, if an angreal is a magnifier of 2x magnitude it's somewhat different in terms of how a non-buffer would end up working. With a buffer our channeler can use 150 with no issues, but without the buffer the number jumps to 160 before they die because they've drawn in 80 on their own and the angreal is doubling that ... Meaning they have pulled in 2x beyond the normal burnout and die increase (10 more instead of 5 more). This clearly increases with the intensity of the angreal so with a 10x magnifier our channeler would be drawing in 800 before death rather than the "safe" 750. Alternatively a lack of a buffer could mean that a multiplier angreal can actually increase from being 10x to say 15x but no longer protects the channeler from the additional influx of power, thus our channeler can draw up to 1,125 or potentially up to 1,200 before death.

Why I see this as important is because an angreal that offers a fixed amount of OP doesn't increase the amount of OP that causes burnout and death so there are still relatively small limits to overdrawing, something like 5-10 v. Potentially massive limits of 50-100. And the fact that they are no longer drawing through the angreal in an additive model, they are only able to draw a fixed amount with an additive angreal whereas a multiplier fits the narrative of "drawing even deeper through the angreal" that we've heard over and over.