Hi Fatis,
It seems to me as if we talk about different aspects. There are Runs which are of course even in High tempi played in one bow. that is absolutly right. The Cube provided for that special recorded "Runs" (which wwere not that easy adjustable) and the Later VSL-Libraries Dimension as Synchron have "Fast-Legatos" for thatI havent tried it yet for Runs, but I expect, that those fast-Legatos does not differ that much.
But my point means another musical aspect:
As soon fast notes become thematically important as it seem to me the case with most of the notes in the theme of Strauss Heldenleben I personally would suggest to emphazise the attack of the single note over the transition between a whole group. ( I thought that you already noticed that the overlapping of slower Legatotransitions can bring up some unrealistic effects, what I do consent) absolutly)
My consequence was just to remind, that Legatotransitions are in fast tempi for the melodic continuity by far of not that importants as they are in lower tempi and a Melody with "Slur"-notation-signs does not sound as played without slur so soon in a fast tempo as it does in slower tempi, while emphazising the Attack definitly raises "in my humble opinion" the attention for the single note even and especially in fast tempi.
If you would decide different than this is of course your interpretation. at that point I thinkl the discussion would make musically more sense to be made with concrete examples. But this is for copyrighjt reasons not possible for me with Strauss so I am limited to give my general suggestions.
But however I did not at all intended in any way to offend you or someone else. And I hope that you didn't read anything like that in my reactions on Stephens experiments as Stephen has asked for with his thread.
So calm down think about what other say and decide what is good for you. thats all.