If you delete your starter builds and have no isk dont worry.

Drop suit fitting> Create Drop suit fitting> You will then notice that not only will you have militia dropsuits to pick from they will also have militia drop suits labeled by there roles: "Sniper, Triage, Assault etc." If you select one of these and save it will restore the default drop suit starter fitting you had permanent militia starter modules and all.

For those who cant figure that out on there own in system operation they should have a "Restore default drop suit fits" function that would also delete all your custom one, or the militia ones you altered.

So no. Technically there is no way to make the game unplayable, at least in the sense where: "I have deleted my starter fits and have no isk, therefore I cannot spawn and the game is now perma broke."

Stop saying it can happen. It cant.

go into your fittings and create what you like.

Also, go to Marketplace >>> Militia Gear >>> Modules/Equipment and get all the ones with a blue box on the left side. Buy 1 of each, they cost 30-60 AUR but are very much worth it. Emphasis, only buy 1 of each of the Militia AUR items that have a blue box on the left side, you get an unlimited supply of them...never have to replace...

ALSO:

This actually makes sense to me, because the assault is just a generally really good suit. Scouts are very situational and terrible for sniping in. Heavies are not something you'd probably want to use swarm launchers with usually, and I guess they don't want heavy weapons to have a militia version. Assault guys can pack a nanite injector as well as anyone. It seems pretty reasonable for assault suits to be the one everybody gets initially, because it's the most broadly useful.