Historical workarounds for dataflow issues meant forcing ID tracking to run sequentially in the HLT. In particular, SCT and Pixel data preparation could run in parallel if given the opportunity.
Since gaudi/Gaudi!1064 (merged) this workaround is hopefully not needed. Assuming the tests pass for this MR, we can try restoring the original behaviour.
This should not change trigger counts: if it does, there's a problem.