Yes, there are good reasons for the general meaning of phrases like this. But "It is easy to see that..." is a very poor choice of phrase for this meaning. Others have already suggested better phrases.
As Buffy expresses, it's not expected for advanced papers to reference, let alone prove every conclusion used. The problem here is the passive voice, and, more importantly:
It is easy to see. What is easy to see?
I see two general phrase choices:
Longer. If you want sentence flow to present a long thought, "From Y, we observe that with/from [few steps or concepts], X.", which carries the meaning more explicitly.
Shorter. What is being said is, "Y. Y => X." (Y being the conclusion the reader is expected to know, from the audience the text is written for.)
This way, you are at least specifying the subject of your sentence.