While I think everyone agrees bonus rolls was nice when it rolled you a piece of loot, the system is too ‘loot box’-esque to remain. The % for loot was heavily weighed against you even with BLP, and the alt rewards are minimal at best.
With the Shadowlands system of 1-piece of guaranteed loot per week (that you choose from), it does solve an issue with the personal loot system that bonus loot doesnt do.