I agree with what you said about toys and perches, however...
1. Just because we see bowls of seed in this photo, it doesn't necessarily mean that these birds never eat anything else. I won't get started on the "pellets vs no pellets" debate. I will say that I go to a forum where many users are from the UK, and pellets are MUCH less popular there...but members have kept healthy birds for years. Their birds eat seeds, vegetables, and appropriate amounts of fruits, nuts, Avi-Cakes, and Nutriberries. My birds currently have seed/pellet mix in their cages - but everyone ate a lot of vegetables earlier. I also know a married couple, in person, who have been keeping birds for about 30 years, and never feed pellets.
2. I use plastic cups in my Budgies' cage. I clean and wipe them very carefully. When the Budgies had access to stainless steel cups, some of them liked to peck at their reflections or remove the cups from the holders. The cups that came with the cage; they don't peck at or move. Currently, one of our Cockatiels is hormonal and defensive over a steel food cup. I might change those to plastic. I know of one other Cockatiel owner who switched to plastic for this same reason.
I am not trying to be rude and I hope I don't sound that way. I just want to help this owner.