Even lazier load of context

[samoht]

It seems that in Dune 3.8.0, the loading of all context is done more lazily than before (which is good!). I don't see any entry in the changelog, so I'm checking if this was expected and won't change in the future. i.e. with an empty project dune + ocamlfind installed, and with just one dune-workspace file that contains the following:

(lang dune 2.9)
(context (default))
(context (default (name solo5)  (host default)  (toolchain solo5)))

I got:

$ opam install ocamlfind dune.3.7.0 -y
[...]
$ dune b ; echo $?
Error: ocamlfind toolchain solo5 isn't defined in
/Users/samoht/trucs/crash/4/_opam/lib/findlib.conf.d (context: solo5
1

while:

$ opam install ocamlfind dune.3.8.0 -y
[...]
$ dune b; echo $?
0

Also, as the context seems to be loaded lazily, could we go one step further and not require ocamlfind at all if that x-compiler context is not used? i.e. right now, Dune will fail with the following:

$ opam remove ocamlfind
[...]
$ dune b; echo $?
Error: Could not find `ocamlfind' in PATH or an environment variable
`OCAMLFIND_CONF' while cross-compiling with toolchain `solo5'
Hint:
- `opam install ocamlfind' and/or:
- Point `OCAMLFIND_CONF' to the findlib configuration that defines this
  toolchain
1

Do you think we could lift that restriction so we don't need ocamlfind at all until we actually want to x-compile?