I really don't like that. Its not taking agency away from the players most of the time, but they:

• Sometimes have situational bonuses you might not know about
• Rerolls/temporary bonuses they may like to use (Like Inspiration, oder lucky)
• Might feel cheated should they ever find out, since you kind of used their character without informing them
• Generally like rolling the dices themselves, as it creates a feeling of excitement and ,,action".