I listen at nearfield distances. I'm not trying to fill an auditorium. My average listening SPL is 80dB and late at night.
I've owned Zu Omen standards, Unions, Omen Defs and Druids and tried each with an 8w 300B set amp, 300B PSE 18W, KT120 SE 24W, EL34, EL84, 845, Class A (SS) 65W, AB 125W SS, Bladelius SS, Plinius 200W SS, Red Wine Audio 15w Class D/valve hybrid and Halcro 400w Class D amplifiers.
What else have you heard the Druids with other than the 440w Class D?
I'm not saying they sound anemic with a solid state amp, I'm just saying they will have more body with a valve amp of lower damping factor and it isn't until you hear both that you will hear the difference. Whether you prefer one over the other is purely subjective of course, but you should at least hear alternate amplification options before making judgements imo.