When "more" is used before adjective or adverb as "inconvenient" in your example, it is an adverb whose primary function is to modify the following word. However, when it is used before a noun (or sometimes after a noun), it is used as a determiner or adjective. For example: I need more money. More context is required. I need something more (to eat). In the above examples, it means: greater in ...
You are correct in your understanding more than 2 is > 2, meaning greater than but not including 2 your other phrase two or more is very succinct and clear, you could also use at least 2 to mean ">= 2 ", it does not need to be entirely spelled out as greater than or equal to 2
Does "more than 2" include 2? - English Language Learners Stack Exchange
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What's more is an expression that's used when you want to emphasize that the next action or fact is more or as important as the one mentioned. War doesn't bring peace; what's more, it brings more chaos. Or your example.
How to use "what is more"? - English Language Learners Stack Exchange
What's the difference between these types of adjective usages? For example: This is more of a prerequisite than a necessary quality. This is more a prerequisite than a necessary quality. (without ...
more of a ... vs more a - English Language Learners Stack Exchange