As mentioned, abyc and nmma are voluntary standards. Not meeting standard and not being certified does not inherently make a vessel unsafe.
Most pleasure craft / recreational vessels in North America (which ranger rugs are) are not certified or inspected, but they will meet USCG requirements, which are very basic.
It's up to the buyer to ensure that their purchase meets their needs. This is also why sime insurers will require a survey, even for a new boat.
Europe has much more strict building and safety standards, but this comes at a price.
Once you get to bigger ships, classification societies will certify a vessel and will require the owner to pay for recurring inspections to maintain the class cert (and thus insurance).
Ranger Tugs are imho a compromise. You get a LOT of living space, fearures and performance from a very reasonably priced boat. Yes that limits the size of the engine bay, fuel hose routing, water hoses end up routed in less than easily accessible areas, etc... but that does not make the boat unsafe.
Another aspect which I find is widely misunderstood by owners of new boats is commissioning. Not unlike a new house that develops cracks in the drywall in it's first year, it's expected that a new boat will require some inspections and adjustments by it's owner. Sure the dealer can make repairs and replace components but it really is up to the owner to get to know their boat inside and out. That is the expected responsibility of any captain.
Boating is not a hands off ownership experience. Maintenance and making small improvements is part of ownership. Every owner should know how to use a dc/ac voltmeter and ammeter and how to bleed a diesel fuel system.
If someone wants or needs a higher build standard, then some manufacturers do offer that. However, expect to add another 0 to the price tag.
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