Ldac is vague, there’s 3 speeds and even if phone supports it uses auto negotiation meaning can be no better.
The Bluetooth implementation, the size and placement of the antenna, the battery size, matter more to get good LDAC.
Bluetooth on most systems have a 2Mbit max, the codec has 1Mbit max, so it doesn’t take much interference to make one person’s experience differ from another.
The focus on LDAC is a path to false conclusion as you can see a review where the Bluetooth signal form some other device is good and YMMV.
I’d recommend keeping skepticism higher where the size of the audio product is smaller, where battery smaller, antenna smaller, and the closer to the ear as the human body absorbs Bluetooth.
Answer: diversity of reviewers.