The default import method for an asset library can now be determined in the Preferences. The Asset Browser has a new "Follow Preferences" option for the importing. The essentials asset library still only uses "Append (Reuse Data)". This is part of #104686, which aims at improving the import method selection, especially for the introduction of the new essentials library (which doesn't support certain import methods). Further changes are coming to improve the UI, see #104686. Pull Request: #104688