As a somewhat recent owner of the A5s (since 2023), coming from a Chario (silk dome tweeter) with dual REL subs, there were are few considerations I had to explore before purchasing the A5s.
1) Room size - given you have B&W 802 they are relatively modest in height and girth. the A5s are comparable vs the A3 which is smaller and probably won’t do the same job in bass, sound stage presence/size and imaging as the A5 (others have commented about this too).
2) Electronics - Magico speakers are what I call "transparent", in other words they sound like what they are being fed - source through to amplification and cables. As you know, electronics sound different. Some do not sound as smooth/delicate and full (or palpable) on the midrange to top end, more 2 dimensional or edgy. Magico speakers are revealing of everything in the signal path including the source - good recordings/mastering vs crap. Garbage in = garbage out. FYI, I’m running a MSB Premier DAC, Rowland preamp and roland amps in bridge mode. I do like the sound very much, but I’m currently exploring Burmester and MSB amps to hear the differnece. I feel there is more umph/definition on the bottom end as well as improvements in mid to upper range and fullness of the instruments/vocals.
3. I asked about the tweeter too - Peter McKay is the rep who can answer all of your questions. I bought the grills for cosmetic purposes, but hardly put them on.
I saw a couple of people using Burmester with A5s - would like to hear from you on which amp and how it sounds.

