They didn’t have the funding to find that out. My theory is that they actually do, but it is slowed down because of the water resistance. This action slowed down appears to us as doggy paddle.

Energy needs can be met and shouldn’t be an argument for using plastic.

The pollution could be more dependending on how you look at that statement, but making something without plastic results in less plastic pollution and you can’t claim that to be an overall loss for the earth.

Size and portability.? Ease of use?

I would ask your colleagues this question, as they can offer the best advice your exact situation. If an entry new starter came to me with that mindset I would appreciate it.

Sorry if that doesn’t really answer the question. What do you already know? That would help offer something at the right level, but my advice is to try learn from the work and people you work with as above.

Seriously, what the fuck kind of animal does that.