A common view is to see Exists as a logical verb, rather than a theoretical one. When we say something like “snow exists”, it’s logically equivalent to the statement “something is snow”.
Whether this statement is true or not is thus a statement about the things that there are in the world, and it being true only implies a commitment to one thing being snow.
Another common view is Occam’s Razor - that we shouldn’t propose that the world contains more than it needs to than we need to understand it. This keeps things both functional and also helps guide a model of the world towards simplicity and ease of learning and empowering.
This is clearly related to the concept of existing things - we want to talk about the stuff that there is in such a way that helps makes sense of the available evidence - but it also makes sense to pull the logical terminology of existing apart from this programme of effective model building using the logic! Less successful models which talk about the stuff that exist can still be logical, and their associated pictures of the things that exist can still be coherent, even if there is disagreement and dispute about what we think the stuff of the world is. In fact, the ability to model the ontologies (the stuff that “exists”) of others is a huge step towards mutual understanding!