Monorepos definitely make it easier. There's a use for dependency bots, especially when collected into one PR so that it can be treated like a newsletter. Was wanting to point out that good habits can go far, but if you're hitting limits then automation is a boon
Ideally if there's multiple repos maintenance can be divided amongst those repo's owners, & once you've divided work between multiple people it becomes more valuable to have a tool help maintain process. These tools need buy in, I've found sometimes they'll go ignored & then the list of PRs becomes mixed up with random dependency PRs
Renovate creates an issue which lists the status of all dependencies in the repository, which it keeps updated. It then creates PRs for each dependency update, which can then have CI run individually to give an indication of any issues with the update.
Ideally if there's multiple repos maintenance can be divided amongst those repo's owners, & once you've divided work between multiple people it becomes more valuable to have a tool help maintain process. These tools need buy in, I've found sometimes they'll go ignored & then the list of PRs becomes mixed up with random dependency PRs