It gets darker, then suddenly goes out
You turn the dimmer down for dinner. For most of the travel, the light remains brighter than you want. Near the bottom it flickers or switches off. The box said dimmable, but the usable result is a much smaller range than you expected.
A driver is the electronics that supply an LED with the power it needs. The dimmer and driver have to understand one another. “Dimmable” says some form of adjustment is supported; it does not say every control will work, or that the lowest level will suit your room.
Before ordering a roomful, ask for the proposed fitting and control to be tested together. Look at the lowest stable level and whether the light starts reliably at that setting. A low-end trim, where supported, sets a minimum operating point. It can keep a system within its stable range, but cannot make an unsuitable combination deliver a level it cannot achieve.
Ask how it dims
I want to know what happens at the levels a room actually needs, not just whether the light gets less bright when someone turns a knob.
Test the uncomfortable moments
Start from off at a low setting. Move slowly through the range. Switch groups together. Listen as well as look. A good sample test uses the proposed equipment and a representative arrangement.
Electrical testing and adjustments should be handled by the appropriate professional. A workaround on the day is not a substitute for a compatible specification.
Specify the experience
An evening room may need a much gentler minimum than a utility area. Put that expectation in the brief and verify it before ordering a full installation.
Dimming is one of the places where lighting design and control design meet most directly. Leaving it to the end is an easy way to compromise both.