The pre-2018 state model didn't have the economy and security bars. Instead, states like Lockdown could be set pending based on particular conditions being met, and then would begin after a minimum pending period had elapsed and no other state was blocking it.
Pre-2018, factions could only be in a single state at a time, across all systems they were present in, and states had an order of priority (with Lockdown being in the lowest-priority group). So if you started a Lockdown, it would then run for 3 or more days, and that duration was set randomly by the BGS rather than by ongoing player input ...
... except that it could be interrupted even before its "minimum" duration by a higher priority state - an expansion, retreat or conflict. So a Lockdown then could also last just 1 day, if a War started the day after, because higher-priority states would overwrite lower-priority ones. (It could even last 0 days, though you'd have to be paying very close attention to notice that!)
This worked pretty well - and in some respects gave rather more interesting outcomes than what we currently have - until factions started regularly occupying tens of systems. At that point they'd generally be setting off Expansion/Retreat/War/Election triggers all over the place, especially from systems they didn't control, so their pending queue would be entirely higher-priority states and the low-priority ones like Boom or Lockdown wouldn't get a chance.