I love DAB but it has problems:

1. DAB tuning is slow. The receiver must collect data and spend 3+ seconds decoding before sound is output. Flipping through channels is annoying as opposed to FM. FM plays instantly.
2. Multiple DAB radios simultaneously tuned to the same station results in unsychronized output. So forget about having radios in different rooms tuned to the same signal as you walk around the house (cleaning, throwing parties, etc). Also means a group of cyclists cannot simultaneously tune the same DAB station. FM is immune to this problem.
3. Many stations share a single transmitter. When a signal goes bad for one station (e.g. bad weather), it’s also bad on ~20—30% of all other DAB stations. Many eggs in one basket.
4. Weak DAB signals are intolerable. The sound cuts off and on repeatedly oscillating between silence and sound (as opposed to analog where there is a relatively steady amount of static that is often tolerable). E.g. In Brussels Bruzz on FM is decent but Bruzz on DAB rarely works. Some people report getting terrible DAB reception indoors.
5. Vulnerable to Internet down time & cyber attacks, I suspect, because the DAB transmission tower likely sources its signals from the cloud.
6. All receivers vulnerable to EMF pulses (thus solar events, nuclear war, and artificially generated EMF). No digital radios use vacuum tubes. Importance of functioning radio is greatly heightened in these scenarios.
7. Most DAB radios do not feature manual tuning. And auto-tuning is unreliable. My current frustration is knowing that a good BBC4 signal reaches Brussels but none of my radios tune it. A Brussels retailer’s demo shelf had a DAB radio playing BBC4, but after auto-tuning the channel was lost.
8. DAB probably does not work well in mountainous areas – unlike AM, which will likely be ditched with FM.
9. Reduced range regional applications possibly complicated or non-viable. E.g. some airports transmit their announcements about flight delays/cancellations over a limited range AM radio which only tunes as you approach the airport.

When stations have both FM and DAB transmissions, you can quickly channel surf on FM. When something good is heard, you can then switch to the DAB version. Newer cars with DAB+ devices automatically switch between DAB and FM variations of the same station. They will lose this advantage when FM is gone.

FM can also seek in realtime. That is, it quickly finds the next strong signal at a given moment. With DAB, you apparently must run a scanning procedure in advance and that takes time. Then those stations are stored but signal quality can change from one hour to the next. Or if DAB can seek for the next station in realtime, I’ve not seen that on any of my radios. In DAB mode, the seek functions are gone.