In terms of total output, yes, it is impossible to differentiate anything from Glare spam. However, that nonetheless doesn't make, even with tuning aside, Reassemble feel identical to Gauss Shot or Life Surge to Jump. They're damn close, sure, but the first in each pair is more co-constrained.
That said...
Between the two, Shinten gives more control over when your damage is dealt, precisely because Kaiten's useful spending depends on the GCD immediately after its uses.
