Don't you think if we have a "A1, A2 and other things that do as A" construction, the restrictive relative pronoun works only for "other things"?
(Examples)
(1)Giraffes, lions and other animals that inhabit Africa
(2)Television, radio and other sources of information that surround us
What restrictive relative pronouns do is identification: they specify, nail down, (a) particular thing(s) among many others. Here in (1) other animals are specified by "that inhabit Africa", and in (2) other sources of information by "that surround us". But it's really weird if you classified giraffes and lions, television and radio by the restrictive relative pronouns although it's clear the former inhabit Africa and the latter surround us.
And our "rugs, towels, baskets and other belongings to which they can return from their seaboard wanderings". "Other belongings" have to be specified by "to which they can return from..." because there are many kinds of belongings: some of them might be disposed of sometime, some given to others, some others kept. However, you shouldn't specify rugs, towels, baskets by "to which..." simply because, as giraffes and lions, television and radio above, they are specific already.
OK. Let's put it this way. If I say:
"Arriving at the beach, people stake out a small territorial claim, marking it with rugs, towels, baskets."
it makes sense; you know why people put them on the beach: they never leave them behind forever; they come back to them sooner or later. However, If I say:
"Arriving at the beach, people stake out a small territorial claim, marking it with other belongings."
it doesn't make sense; you'll never know what kind of belongings they are and why people mark it with them. Then you need to specify what they are, and one way to do it is to use a restrictive retative pronoun.
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Well, as you say, maybe I'm trying to slice things up too much. But when it comes to translation into Japanese, sometimes I have to do it and analyze them in detail. :wink: