The fact that employers are trying to "cunning" has always been, but in different areas at different levels, but very often ... Therefore, it is easy to "fight" with dishonest employers by formalizing relations.
This is a proof that not every time you need a contract, if you do not have a contract and they screw you over because of it, that's a good price to pay to see if they are worth working for or not, if they scam you, it's a quicker way of quitting and finding a better job.
Trust is a good thing, and it's worth a lot.
But there are situations when people, for various reasons, even being your close friends/partners, may not behave very adequately. And a two-sided document, this will only add honesty to the relationship! Of course, some will say that this "looks like distrust", but I always say that any relationship between 2 or more people should be formalized so that there are no unpleasant moments later. for honest partners / relationships, such a document will not be an obstacle! Unfortunately, practice shows that conflict situations often arise that cannot be resolved due to the lack of documented obligations.
And what else I will add - from personal practice I noticed that people who are not very clean at hand, or in thoughts, just try to avoid such a formalization of relationships, and normal people treat formalization with understanding.