...
(I noticed in other paradox games players tend to ask questions like "How can I blitz like the German Wehrmacht" or "How do I play like Frederick the Great?" where in Stellaris it's "why won't my fortresses work!"... says something about the players ^^' )
Not sure this is a fair assertion. Baring a geography and front lines in Stellaris every move is blitzing as it's easy to bypass strongpoints and hit whatever is in your reach added by fast deceisive victories in fleet clashes allowing to roll up even large empires once the fortune of war turned into your favor and the broken remants of their main fleet is on the run.
I think the main idea behind fortresses and defenses (e.g. mine fields) is to create something resembling a geography in a system because overall currently you only have either the enemy's main fleet or easy targets ready to die.
There is no geography to the wars which would inform strategy, logistics and the like.
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