I don't think this behavior is specific to 1.3 or 1.4 but I am not sure. What I am seeing often though is a playbook out of the CIV games when their AI is a disfunctional mess. The Stellaris AI keeps sending little fleets one or so at a time against my big 5K fleet. Now mind you it only starts doing this after its main fleet gets wiped. But still, it should not set a course for and attack a 5K fleet when its a single corvette or destroyer. Not good at all. It's stupid AI decisions like this that drive me insane and ultimately lead to the end of a strategy game like this. Hopefully this can be improved in 1.5 somehow.
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