A transcendence is just surpassing some boundary. High 1-A surpasses the transcendence 1-A already performs on the properties that define its domain, like space and time.
Think of it like this, for 1-A, the boundary it surpasses is usually all possible dimensional spaces and cardinalities as that would encompass all movements on the framework of space and time. This is a baseline because for most verses, space and time are pretty much standard governing forces that tell you how one exists in the main setting. The entire tiering system from 11-C to Low 1-A can be defined as a difference in extents of space and time. So the transcendences are denoted as all quantitative because they fall under only increasing your dimensionality, which is category for all degrees those tiers operate on.
However, a R>F transcendence is more so qualitative, so it goes beyond the quality of what defines the tiers from 11-C to Low 1-A. The reason an R>F transcendence is a representation of this is because it dissolves the actuality of a lower reality. So if space and time are properties shown in a given realm, an R>F transcendence to that realm dissolve those properties entirely. It essentially reduces the whole framework the lower reality operates on(space and time) to non-existence relative to itself, which is still actual. This makes the higher reality actual in a way that’s distinct and outside of space and time, otherwise it wouldn’t dissolve the actuality of that domain in the first place, thus 1-A. And further levels into 1-A are basically just a further movement out into that higher mode of being.
With High 1-A, meta qualitative transcendence can be thought of as surpassing qualities rather than just a further movement through a single higher qualitative existence like with 1-A. So it takes what was one big jump through a whole framework, and turns that into individual layers. And those layers go on with no real end as you can keep stacking qualitative frameworks.