"A Fermata is usually a pause of all instruments, and only requires a single, lower tempo to the achieve the desired pause."
This sentence is a very interesting view. Perhaps it is the first absurd argument made in musicology.
The term 'fermata' is merely a slow instruction, and the slow control is assumed to be in the free will of the performer.
Also, if the instrument is superimposed, a fermata in one place requires breathing for each instrument.
So it's a very narrow-minded idea to need only one low tempo.
In addition to the fermata, each instrument requires proper breathing, either when expressing a rubato or when moving from one frame to the next.
Curves and straight lines, or just one low tempo, are never enough to express this.
I understand that too dense speed changes put a load on FX processing. If there's a lot of data, there needs to be a process about it.
But what I pointed out is why the features and information of the previous version disappeared after the update.
It is a fatal problem that the previous project is loaded and not accurately reproduced to its old condition.
I have pointed out that it is a separate issue from re-drawing or re-conditioning tempo information, and by no means am I going to have a 'unique' debate on the speed of music like Fermata.