[QGIS-Developer] Temporal controller issues

[Cory Albrecht]

Can somebody help me under the basics of how things work inside QGIS
starting from when it loads all the features for a layer through the steps,
and then finally drawing them on the map canvas, specifically with respect
to the new temporal controller (NTC)?

The issues caused by the NTC have been very frustrating for me as I make
mostly (historical) timeline maps and I relied heavily on the old
TimeManager (OTM) plugin by Antia Graser and group. So many tasks are now
much more laborious or difficult because so many tools are just not
time-aware.

Was it not possible to add the NTC in such a way that would have still let
all the other features work as before with the filtered feature set before
being made time-aware, rather than confusingly operating on the
unfiltered set? Or perhaps it shouldn't have been turned on until the
infrastructure was there for the tools to be time-aware right away?

Because I've just submitted yet another bug about the NTC, this time for
the selection tool <https://github.com/qgis/QGIS/issues/40818>, and it has
me more than a little annoyed. As a result of this bug I now have an
unknown number of duplicate objects in multiple layers across multiple
databases/projects that I unknowingly pasted into them over the past
several months since the NTC was added to QGIS.

I feel that the NTC was both poorly thought out and badly implemented as
all these bugs would indicate.
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