Hi, André's answer sums it up well. To put it simply
Environment management, Asset Library (and Solution management for ISVs) still the core, actively-used components in LCS today.
Methodology, Project onboarding, BPM these supported implementation guidance/process documentation, but BPM has effectively been replaced by the Business Process Catalog.
Also worth keeping in mind since LCS itself is being deprecated in favor of the Power Platform Admin Center (PPAC), if you're planning new projects, it's worth getting familiar with PPAC's equivalents going forward rather than investing further in LCS-specific setup.
Thanks