Why Beatty wanted HMS Tiger before her trials were complete

Why was HMS Tiger assigned to Beatty before she had completed more trials?

Beatty wanted the newest major ship as his flagship, unlike Jellicoe, who was willing to keep an older flagship.

Tiger joined Beatty before completing more trials because he insisted on having the newest major ship as his flagship. Jellicoe behaved differently: when Queen Elizabeth-class battleships joined the Grand Fleet, he kept his flag in King George V. Beatty repeatedly sought newer ships and later tried to move into Renown, making flagship choice part of his status-conscious command style. His political skill did not always extend to planning for future consequences, so personality and readiness both shaped Tiger's assignment.