We have trouble with defining life on earth.
Life: Grow, Reproduce, Consume Energy.
Fortunately science doesn't much care about our definition of life (or the lack of definition, in this case)
Virus cannot reproduce on their own.
But discovering a thing acting similar to a virus but doesn't operate by any of the methods we know would still be an amazing discovery and a wealth of knowledge to research.
Crystals seem to show many properties of life.
Discovering a thing similar in structure to a crystal where no known methods of crystal growth are apparent would also be an amazing discovery and a wealth of knowledge to research.
Fire can Grow, Spread and it consumes energy.
Discovering a chemical reaction that is different from any known chemical reaction would too be an amazing discovery and a wealth of knowledge to research.
What about individual cells that are part of a larger organism...
History shows us both the individual cells as well as the larger organism, not to mention the cell behavior, higher structures formed out of the cells, and the organism as a whole will all be fascinating and a wealth of knowledge to research.
It still kinda comes down to Ill know if it I see it.
If any of the things on your list was discovered and found to not work in a way we already know about, someone somewhere on our planet will jump at the chance to research it - life or not.
And the best part, even if that would come to be and we do discover any of those things completely different from what we know, it will matter as little afterwards as it did before if they are called life or not.
More knowledge being gained is always a good thing, since the worst case is no gain but no losses and the best case is huge gains with no loses.
Gaining just some knowledge instead of much more than some knowledge is not a valid reason to avoid learning.