Proposal I suggest adding a "Temporary Bundle" feature to group related emails from different senders into a single, named container that can be dissolved later. This fills the gap between permanent folders and automatic threads.

Key Use Cases:
Transactions: Grouping order confirmations, bank receipts, and shipping notices from different sources without creating a unique folder for every purchase.
Short-Term Projects: Collecting scattered emails for research, event planning, or coordination tasks that don't warrant permanent archiving.

How It Should Work:
Create a named bundle (e.g., "Pool Order" or "Event Planning").
Drag emails from various threads into it.
Tag items individually within the bundle.
Dissolve: When finished, easily move specific emails to permanent folders (or delete them) and close the bundle, leaving no temporary clutter behind.
Benefit This would streamline workflows for active, short-term tasks while keeping the inbox and folder structure clean.