Re-iterating, adding TAGS into the current inbuilt sorting criteria is an important one for me (especially for the Focus view).
Add it to the 2nd last criteria (before Alphanumeric) would be hugely useful (so it becomes something like Due/Completed Date, Priority, Tag, Alphanumeric). This would ensure common tags (of the same priority) are seen together. (If multiple tags exist, just the first tag is used, which is how a task's colour is determined when colour is based on tag). So to be clear, my votes here are for this enhanced criteria based approach, not the manual sort approach (although useful, I can see would be programmatically more challenging).

Adding TAGS into the current inbuilt sorting criteria is an important one for me (especially for the Focus view).
Add it to the 2nd last criteria (before Alphanumeric) would be hugely useful (so it becomes something like Due/Completed Date, Priority, Tag, Alphanumeric). This would ensure common tags (of the same priority) are seen together. (If multiple tags exist, just the first tag is used, which is how a task's colour is determined when colour is based on tag). So to be clear, my votes here are for this enhanced criteria based approach, not the manual sort approach (although useful, I can see would be programmatically more challenging).

To be specific, I think adding TAGS to the inbuilt sorting criteria as the 2nd last criteria (before Alphanumeric) would be hugely useful (so it becomes something like Due/Completed Date, Priority, Tag, Alphanumeric). This would ensure common tags (of the same priority) are seen together. (If multiple tags exist, just the first tag is used, like how colour is determined, if based on tag). So to be clear, my votes here are for this enhanced criteria based approach, not the manual sort approach (which I can see may not be practical).

PLEASE add TAGS as one if the sorting criteria. This is an important one for me (for the Focus view).

Thanks for implementing my request (4) ability to search on completed tasks
So just summarising my remaining requests here
1) Greater date range options, including ALL.. Understand an ALL search is a problem on phones with insufficient specs/memory, so perhaps this could be an advanced option (off by default) and/or a message appears warning of potential performance issues doing an ALL search.
Note: this request (1) is the most important to me
2) Word search vs Sentence search. Just like iOS Contact search, each word to be treated separately (eg "dinner smiths" searches any instance of "dinner" AND any instance of "smiths" anywhere within any item). Other times we may really want to treat the search string as a sentence (actually searching for "dinner smiths"). So an option to do one or the other would be great. Otherwise, Word search is definitely more useful and should be default.
3) Ability to specify a selection of tags
5) Ability to export the results (email, copy, etc)

Update 3) Ability to specify a selection of tags

Update 5) Ability to export the results (email, copy, etc)

Update to 1) understand an ALL search is a problem on phones with insufficient specs/memory, so perhaps this could be an advanced option (off by default) and/or a message appears warning of potential performance issues doing an ALL search.
Note: this request (1) is the most important to me, while the others would also be nice too

Update to 4) I usually don't care about completed tasks, so appreciate how I5 no longer includes them in search results (PI4 did), but sometimes I do, so a checkbox to be able to include or exclude completed tasks would be great

The Dark Nite theme in PI4 was perfect for me. The new Dark Mode is not usable for me, for two reasons:
• it alters existing colours (like my carefully chosen Tag colours, and grid lines in month view, and other elements), which from prior discussions with you, is due to underlying iOS functionality used for this feature.
• it darkens the whole interface, not just key elements like headers and footers, like Dark Nite did

That would make perfect sense (and be consistent with how Month view's today button - which should also show the current date I believe).

Also, the today button doesn't update itself to the new current date, when Informant remains in the background overnight)

Please add same fields as Templates had. Especially need the fields "Project/Sync account", and "Tags"