So, here is why I'm mystified by your retort. You are "NOT familiar with the vagaries of" the U.S. "legal system." Yet, your lack of familiarity with the U.S. legal system is no deterrent to you assuming Trump has violated an obstruction of justice statute. Rather than take some time to conduct some research in an effort to support your assumption Trump has violated an obstruction of justice statute, you instead invoke your lack of familiarity with the U.S. legal system as an excuse to do no research, indeed to make no effort at all to support your assumption Trump has violated an obstruction of justice statute, but request other people establish how Trump hasn't obstructed justice.
Here's my point. It's apparent you, and many others, are inclined to believe Trump obstructed justice, have a desire to believe Trump obstructed justice, but really have no idea as to whether Trump did or didn't obstruct justice. You, and many others, just want to believe and assert Trump obstructed justice and whether you have an informed belief, a correct, belief, is irrelevant.
Which explains why you have no difficulty assuming Trump obstructed justice but are derelict in your responsibility to substantiate your assumption, while denouncing any notion you should substantiate your assumption because you "lack familiarity" with the U.S. legal system.
I'll say the following, the obstruction of justice statute, that best fits these facts, has a particular element which, legally, is very problematic in its application to these facts. Another element of the statute, while less problematic in its application to these facts, is difficult to satisfy because the facts do not easily or clearly establish the element.
If you have access to Google, you can very likely identify the most applicable statute and discover, there has been a lot of proverbial ink spilled on the legal and factual nightmare of applying the statute to these facts.