A low-level loop is a for, while, or do statement, such as:

std::vector<gc::ObjectMetadata> output;
for (const auto& namespace : data.namespaces)
  output.push_back(namespace->object_metadata());
return output;

One should, instead, write something like:

return data.namespaces |
       std::views::transform(&Namespace::object_metadata) |
       std::ranges::to<std::vector>();

In a vacuum, I would agree with you. But for a simple loop like the one you have shown, using ranges is absolutely overkill.

The logic is obvious even with the first approach (just missing a reserve). The ranges version will have a non-negligible impact on compilation times and debug performance.

I like ranges, but -- just like auto -- they shouldn't be used everywhere. Use them sparingly where their benefits outweigh their cons.