Horrible accessibility. Not enough sitting space for old people and at the same time no designated space for wheelchairs/Bikes/ baby-waggons.

I hate see-through stair because when you wear skirts-dresses you will get scared of people looking from below+ height-scares for people a bit scared of altitude. Also there will always be the chance that some litter/dirt from shoes can rain on peoples heads which will be unpleasant.

Also when it gets crammed I imagine it will be even worse for a tram to get out the next stop.

Genuinely I think double deckers work better for regional/long-distance trains and from my experience they can be really great there. For trams I think you want to make it easy for people to get in/out and make them as accessible as possible. It's better to make them longer when you want to have more passengers and it avoids many problems of which this paticular design has many.