No surprises here. Just like the lockdown on iPhone screen and part replacements, Macbooks suffer from the same Apple’s anti-repair and anti-consumer bullshit. Battery glued, ssd soldered in and can’t even swap parts with other official parts. 6000$ laptop and you don’t even own it.
The issue lies in assuming that repairable laptops cannot be optimized to the same extent as MacBooks. However, this assumption is inaccurate. While there might have been a problem with your Asus ZenBook, I can assure you that if you were to select a Windows laptop priced similarly to a MacBook, you would find a comparable level of optimization. Additionally, there’s the added benefit that you can swap out the battery when it starts going bad and upgrade the RAM and storage if you need to in the future