Why not pointing at:

• maven/impl/maven-core/src/main/java/org/apache/maven/internal/impl/DefaultLifecycleRegistry.java

  Lines 383 to 412 in 751d3f1

  	ALL,
  	phase(VALIDATE, phase(INITIALIZE)),
  	phase(
  	BUILD,
  	after(VALIDATE),
  	phase(SOURCES),
  	phase(RESOURCES),
  	phase(COMPILE, after(SOURCES), dependencies(COMPILE, READY)),
  	phase(READY, after(COMPILE), after(RESOURCES)),
  	phase(PACKAGE, after(READY), dependencies("runtime", PACKAGE))),
  	phase(
  	VERIFY,
  	after(VALIDATE),
  	phase(
  	UNIT_TEST,
  	phase(TEST_SOURCES),
  	phase(TEST_RESOURCES),
  	phase(
  	TEST_COMPILE,
  	after(TEST_SOURCES),
  	after(READY),
  	dependencies("test-only", READY)),
  	phase(
  	TEST,
  	after(TEST_COMPILE),
  	after(TEST_RESOURCES),
  	dependencies("test", READY))),
  	phase(INTEGRATION_TEST)),
  	phase(INSTALL, after(PACKAGE)),
  	phase(DEPLOY, after(PACKAGE))));

• maven/impl/maven-core/src/main/java/org/apache/maven/internal/impl/DefaultLifecycleRegistry.java

  Lines 472 to 476 in 751d3f1

  	phase(PHASE_SITE, plugin(MAVEN_SITE_PLUGIN + "site", PHASE_SITE)),
  	phase(
  	PHASE_SITE_DEPLOY,
  	after(PHASE_SITE),
  	plugin(MAVEN_SITE_PLUGIN + "deploy", PHASE_SITE_DEPLOY)));

• maven/impl/maven-core/src/main/java/org/apache/maven/internal/impl/DefaultLifecycleRegistry.java

  Lines 361 to 365 in 751d3f1

  	return List.of(phase(
  	Phase.CLEAN,
  	plugin(
  	MAVEN_PLUGINS + "maven-clean-plugin:" + MAVEN_CLEAN_PLUGIN_VERSION + ":clean",
  	Phase.CLEAN)));

They are not much readable for non developers, but maybe our target would know enough ?

The changes to the modello generation leads to unneeded processing if not building the site. That was done on purpose to simplify the config ?