Using isEnabledUseLastLTSFCVWhenUninitialized() is more accurate (specifically if there's a feature flag that is enabled by default on the lastLTS FCV). See this doc for an explanation. 

The goal of this ticket is to:

1. Understand the impact of replacing calls to isVersionInitialized() && featureFlag.isEnabled() with isEnabledUseLastLTSFCVWhenUninitialized(). Since using isVersionInitialized() && featureFlag.isEnabled() is a general antipattern, the investigation should also incorporate prior versions.
2. Explore a solution to ensure that new occurrences of the antipattern are not added to the codebase.
3. Depending on the outcome of (1) & (2), do the actual replacement either as part of this ticket or a followup.