One thing that I find as important on packaging for vape liquid is the flavor profile of the liquid.

Some brands use unique naming for their e-liquid. As an example, one popular brand illusions vapor makes products like Nirvana, taste of gods, and the prophet. None of those product names tell you anything about what flavor they are (illusions is by far not the only one, just one that I've seen most shops carrying).

For those curious, Nirvana is mango/peach, taste of gods is pineapple/coconut/black current, and the prophet is dragon fruit/berry/guava.

The names are nonsense, but the packaging will generally illustrate the flavors, by depicting the thing they're based on for the art on the product. Taking away the ability to have any art on the product, having a short description of the flavor profile can seriously help with selections when considering a new to you e-liquid.

Back in the day, before vaping was subject to the same restrictions about indoor use as cigarettes, testers were common. Shops would have relatively cheap vape pens and hand out single use tips for them (where you actually put your mouth), and fill them with 0 mg (no nicotine) versions of the e-liquid so people can just try it.

Since that's almost entirely illegal now, and every vape shop I know of is trying to abide by whatever laws are in place, the practice has gone extinct. Tragically, this opened the door wide for disposable vapes, which I really do not like.

Where I am there's also child resistant packaging laws, which is designed to make it harder for children to get access to the liquid inside the vape. This also fueled a disposable vape movement, since it's easier to deny access to the liquid if you have zero ability to fill, refill, empty, or otherwise access the liquid in the device. Disposables are a gigantic waste of resources and the single worst way to vape IMO. Juul was better, bluntly.

I'll get off my soap box. The point is, all those that are trying to be legit and legal about their use are going to be the ones suffering from additional legislation. Those doing illegal shit and giving this stuff to kids or whatever, don't care what laws are in place and will continue to do whatever the fuck they want. More legislation isn't the answer. Enforcing the laws we already have, is.