Now in Beta: Ripple Trim Adds Edits to Keep Both Sides of Trim in Sync

I agree, using this feature without maintaing scope of what is being trimmed and where edits are being added could cause a lot of confusion by creating jump cuts.  As @Jarle Leirpoll said, there's definitely a reason we designed this as a feature that can be enabled/disabled. 😁  I'd also propose that these added edits would create a lot of confusion if you don't expect them, and by enabling the feature, one would come to expect them rather than be surprised by them since it is the feature's design to add these edits.  The placement of edits is also controlled by the trim selection (more on that at the end).

The benefit is that this feature allows you to edit without worring about overlapping clips shifting or blocking trim operations.  You've both noted that there may be cleanup to do after the trim is performed as edits are created. However that would also be true if you move the blocking clip out of the way that's causing trim restrictions, since that clip would need to go back into place after your trim is done, but now that the underlying edit has changed, the moved clip likely also needs cleanup to drop back into place.  This new feature provides a different avenue to the same goal.

The example GIF provided above is a simplified illustration of the functionality of the feature, and the individual ways each editor may use it are much more nuanced. Using the gif as an example, if the clip on V2 were a static title, then this new feature is very helpful as it keeps the start and end of the title in sync with both sides of the underlying edit as it is trimmed, and there is no consequence of adding an edit in the middle of the static title.  This would also be true if the overlapping clip were a letterbox matte covering your entire sequence - any edit could be trimmed without ever creating gaps in the matte that needed to be cleaned up/filled.  Another example would be if the audio on A2 were music or a sound effects bed - you need to adjust the scene, but you know you ended the audio at exactly the right spot to align with a dramatic moment.  So as you trim, edits are added to the audio on A2 to keep the ending alingment in sync.  You then go back and fix the added edits to the music/sfx while having maintaned the precise in-sync reference for where you previously ended the audio... you don't have to find that perfect spot again.

Really, though, the true power of this feature doesn't necessarly apply to clips that overlap on higher Video/Audio tracks, but rather clips that intermingle on lower Video/Audio tracks below.  Let's take an example of a much more complex timeline than the one in the above GIF, one with many stacked video layers and many layers of audio for sound design.  Instead of trimming on V1 and A1, you select edits to trim on V3, V4, A1 and A6.  What happens on V1 and V2 doesn't really matter too much since they're covered by footage on V3 and V4, but you want V1/V2 there as alt takes to reference back to, and having them block trim edits is tedious to deal with.  Similarly, A1 has dialog synced to one of the video tracks, and A6 has an off camera radio broadcast that needs to sync with on camera character reactions that you are trimming.  A2, A3, A4 and A5 are room tone and sound beds that extend well off the screen given your current zoomed in view of the timeline, and these tracks can seamlessly be patched by dropping cross-fades on resulting added edits.  In this example, this feature allows you to trim what you need to without having to explicitly select every single edit point that needs to be driven to allow an unblocked trim, and without zooming/scrolling the timeline to find edits off the timeline that need to be selected.

On the flip side of all of this, and going back to the GIF, if the intent was not to add edits to the clip on V2, but instead roll the out point back as @David Arbor suggested, you'd achieve this by adding the tail edit point of the V2 clip to the trim selection, so that it trimeed along with the selected V1 and A1 edits.  You could select the A side to trim the tail of the V2 clip, or the B side to maintain the clip's length and trim the gap after it.  Once a track has an edit selected for trimming, it is a part of the trim operation itself and no new edits are added to any clips on that track, and so in this case no new edit would be added to the clip on V2.