The tall grill means impact to pedestrians, bicyclists and motorcycles is basically instant death as their head - the only thing above the grill - gets whiplashed onto the rigid tip of the hood. On a normal vehicle you get your legs swiped and rotate your whole body onto an intentionally flexible area of the hood for a much gentler impact.
The visibility from the driver seat is not only much worse than our actual semis, but also worse than actual tanks. You could have half a kindergarten and a small vehicle in front of your car without knowing.
As for the tax, eh - tbf these vehicles are mostly used for business purposes by sole proprietors and the likes, and while they're stupid vehicles they do still do the job. A fully decked Iveco Daily or Mercedes Sprinter is also expensive with little registration tax. Registration tax is a weird (and arguably stupid) system, this isn't really an outlier in that regard.
I roll my eyes more when I see a sports car attempted registered as a van.