LoginBlock not allowed on /user/login

We placed the the openid_connect_login block on the /user/login page, but once we upgraded to 8.x-1.0-beta3, the block was no longer appearing. The cause is that the blockAccess method in the LoginBlock plugin class was updated to prevent access on the user.login and user.logout routes. Is there a reason for this? It seems the $account->isAnonymous() check should be sufficient.