I"m using several work and home Gmail accounts, and manage them using Thunderbird for the most part. I started to use the Gmail application on my Pixel 3a device recently for a throwaway account just to see how it worked.
One of the main issues that I ran into was that I could not figure out how to speed up bulk operations. While it is possible to select one or multiple emails and run archive or delete operations on them, or use swipe gestures to deal with individual messages, it is not possible to select multiple messages at once.
If you want to archive or delete all inbox messages for examples, you find no option to do that quickly in the Gmail application for Android or iOS.
Here are your options in the Gmail app:
Here is what you cannot do using the apps:
The best option that you have is to use the Gmail web interface for these operations. While you could perform actions on single emails in the apps if you have only some listed there, it is quite the nuisance if you need to delete or archive hundreds or even thousands of them, e.g. to have zero emails in the inbox.
Here is what you need to do:
Using the web interface is much faster than using the Gmail application as you can run the desired actions on hundreds or thousands of emails instead of just one at a time.
Now You: Which email service / client do you use?