For a couple who have everything
The list covers objects. What it cannot cover is anything about the two of them specifically.
The list covers the household. These are the parts nobody buys for: the proposal, the stag and hen, the entertainment, the favours, and the gift for two people who need nothing.
A wedding generates more gift-buying than any other occasion and almost all of it is directed at a list the couple wrote themselves. That is efficient and it leaves the interesting problems untouched.
The interesting problems are these. What to give a couple who have lived together for six years and own everything. What to do at a reception where two families who have never met are supposed to talk to each other for five hours. What to put on the tables that guests will not leave behind. What to give five groomsmen that is not the fourth engraved hip flask they have received. And how to propose to somebody who would hate a public gesture.
The thread running through the answers is that a wedding is about people being in a room together, and the things that work are the things that help with that. A gift that captures the group, an activity that gives strangers something to talk about, a favour that gets opened at the table rather than carried home. Anything decorative is competing with a day that already has more decoration than it needs.
One practical note that applies across all of it: use ordinary photographs rather than the professional ones. Wedding photographs show people performing, in clothes they do not normally wear, and anything made from them produces characters who look like they are at a wedding rather than like two people.
The list covers objects. What it cannot cover is anything about the two of them specifically.
The real problem at a reception is that two families do not know each other. Solve that and the evening works.
Walk round any reception hall at midnight and count what is still on the tables. That is the data.
Public proposals suit a small minority and are marketed to everybody.

The whole difficulty of an engagement gift is that it arrives before anybody has decided anything.

Every groomsman over thirty owns three engraved hip flasks and has used none of them.

Not everyone wants a flight, a forfeit and a group chat meltdown. Ideas built around your actual friends rather than a package.