Nobody seems to be discussing this issue, and further still the few that are could only guess on why it worked this way, so I figured it'd be good to lay out exactly why Sparkle fails as a energy generator for Acheron's ultimate in Honkai Star Rail.
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00:00 Premise
00:48 How Acheron gains Energy
01:12 How do Battlestart Debuffs Work?
02:39 Why Jiaoqui Works
03:00 More "Abilities" count than you think
04:21 So why doesn't Sparkle work?
04:37 Point Use vs Ability Use
06:43 Closing Notes
08:04 Outro