We use _custom_access in a lot of places. In quite a lot of occurrences the custom implementations could be replaced with other existing route access checks, requiring no function calls. See https://www.drupal.org/node/2092643#section-requirements → for an overview of what is available, take note that multiple permissions may be combined using and/or.
Make better use of entity access checks (possibly for custom operations) or other available route requirements.
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