I would say that the Dali is more dynamically flat than the Tannoy. A bit dry is exactly the way it sounds to me compared to the Tannoy.
I have never noticed timing issues with the Tannoy. In fact, it sounds much more precise than the Dali.
Unrefined treble sounds ridiculous to me, especially when compared with the Dali. I have paired the Tannoy with several amplifiers from different generations - 70's, 80's, 90's and nowadays and never found the treble unrefined. I would say that the Mercury 7.4 is one of the most refined and universal speakers I have heard in this class. Not to mention the statement - "Not an easy listener". I listen to the music every day. Sometimes for several hours. I have found exhausting many speakers, especially the Dali, but never found exhausting the Tannoy, nor did any of my friends. On the contrary 1/3 of them find the Dali exhausting which is considered by what hifi as an "easy listener". Unfortunately, I have never heard the Q Acoustics 2050i and 3050, but I would gladly exchange my Dali for a Q Acoustics speakers and would definitely compare them with both the Tannoy and Dali speakers.
Bass needs more control? Tannoy speakers are famous for their quality bass. I have not heard a more precise bass in that price range than the one of Tannoy speakers and I would say that the Mercury 7.4 is no exception to me. In fact, the bass of the Dali suffers from a bit poor control. Not to mention the uneven frequency response of the Dali, which makes it sound hard, boomy, with a lack of impact...
In fact, I don't have a single friend who has preferred the Dali compared to the Tannoy. Most of the have listened to both of them in several different pairing combinations.There are two things that usually impress them in the Tannoy and these are the bass impact and the clean and detailed mids, which is quite the opposite to what i read in the what hifi review. And by the way, some of them are quite experienced in the audio sphere - ex-musicians (violin, piano), ex-consultants in audio stores ...