Elden Ring hero Let Me Solo Her says Shadow of the Erdtree isn't too hard, "many people are just too harsh" and should "use everything at their disposal"
How did FromSoftware address the difficulty complaints?

FromSoftware addressed the difficulty complaints by releasing a calibration update for Elden Ring's Shadow of the Erdtree expansion. This update included minor balancing tweaks, such as adjusting the attack and damage negation curve scaling of the Shadow Realm and buffing early Scadutree levels4. These changes aimed to make the game slightly easier and alleviate some of the frustrations players were experiencing.
What is Let Me Solo Her's overall opinion on the DLC's difficulty?

Let Me Solo Her, the renowned Elden Ring player, believes that the Shadow of the Erdtree DLC is challenging but generally fair in difficulty. He suggests that players should make use of all available resources to overcome the difficulties, and he thinks that the final DLC boss is on par with Malenia in terms of challenge.
How does Let Me Solo Her rate the DLC bosses compared to Malenia?

Let Me Solo Her, the Elden Ring player known for helping others defeat the notoriously difficult boss Malenia, generally rates the DLC bosses below Malenia in terms of difficulty. He believes that while the DLC bosses test players' skills, they are not as challenging as Malenia's unforgiving attack animations, two exhausting phases, and life-sapping mechanic.