This issue is lists features missing in the new installer UI as well as general todos:

• --cache-only and --use-build-cache flags new_installer.py: implement --use-buildcache, --cache-only, --use-cache and --only #51593
• --dirty, --keep-stage new_installer: --dirty, --keep-stage, and skip patch #51558
• --include-build-deps new_installer.py: implement --use-buildcache, --cache-only, --use-cache and --only #51593
• --only new_installer.py: implement --use-buildcache, --cache-only, --use-cache and --only #51593
• Overwrite installs (--overwrite and dev_path=* installs) new_installer.py: implement overwrite, keep_prefix #51622
• --keep-prefix new_installer.py: implement overwrite, keep_prefix #51622
• --dont-restage new_installer.py: implement --dont-restage #51623
• --fail-fast (new_installer.py: implement --fail-fast #51968)
• Improve database handling (new_installer.py: delayed database write #51951)
• -p (new_installer.py: implement spack install -pN #51641)
• Log parsing on error (new_installer.py: parse build log on failure #52000)
• Locking for concurrent Spack processes (new_installer.py: initial multi-process support #51985)
• Write Spack logs (spack-build-env.txt, spack-build-env-mods.txt, spack-configure-args.txt, etc.) (new_installer.py: archive build provenance metadata #51999)
• Provenance in the .spack/ dir (other than spec.json and build logs) (new_installer.py: archive build provenance metadata #51999)
• signal.signal(signal.SIGWINCH, handle_resize) self-pipe trick to poll for terminal resize
• --test (new_installer.py: add --test support #52047)
• --fake (?) (new_installer.py: integration testing #52049)
• Reporters (cdash/junit) (new_installer.py: reporters #52058)
• Log filter (long paths) in the UI new_installer.py: better color support (and a small path filtering fix) #52072
• Colors in non-TTY mode when SPACK_COLOR=always new_installer.py: better color support (and a small path filtering fix) #52072
• --source new_installer.py: support --source #52122
• db.mark(explicit=True) when a spec is already installed but the current request is explicit new_installer: mark explicit also if already installed implicit #52120
• --until new_installer.py: support --until #52123
• Suspend / background / foreground new_installer.py: suspend, background, foreground #52101
• Elapsed time in UI new_installer.py: elapsed time #52163
• is_occupied_install_prefix check (two different specs mapping to the same prefix) new_installer.py: defensive checks #52146
• Failure tracker (failure_tracker.mark/has_failed/clear), so concurrent spack processes skip known failures new_installer.py: support failure markers #52114
• timers.json with per-phase timing data
• Error on database lock timeout

Bigger items:

• Dynamic build deps scheduling
• Rewiring jobs (trivial after by item above)