I do the same, 3,5 or 4 mm bullets/tubes in line, wrapped with heat shrink tube (one piece per joint).
Means there's no way for the connector to come undone during normal use/crashing. No chance of a short either.
It's good to do while you are in a swapping motors/settings/spurs/pinions/diffs phase.
Just need a scalpel/craft knife to split the heat shrink before swapping motors.
If the motor isn't likely to come out for a good while i.e. you have finished tweaking your set up, and it's fairly stable, I just change to soldered connections.
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