Enable Decay score while timeframe is set. OR decay workflows that works on lead scoring properties.

For most leadscoring it is paramount to have a decay, or the score will accumulate and skew reality of current buying signals.
Hubspot, unfortunately, does not yet support decaying scores when you set a timeframe for your scoring.
In our case, we would like to create a new score intended to work for events only from this year and onwards, which is not an unreasonable thing to do when creating a new score. However, Hubspot does not support decay in this case! The alternative is a score that retroactively takes all the historical score from a decade ago and then applying decay on that gigantic cumulative score… (and here the lead scoring loses its business value instantly).
I’ve tried to create workflow with a time/decay trigger, but unfortunately lead scoring properties are read-only. So there goes that.
I will try active segment membership with a decay filter to try to decay the score through segment membership score subtraction in the lead-scoring module.
But in the end, why can’t hubspot just support decay score AND timeframe natively? To me they don’t need to be mutually exclusive logically.