Are assessments really required?

Are assessments really required? Who are they important for - students or teachers/researchers? Do the students really need to know what they "know"? When they are in the class interacting with their peers and teachers then they are obviously learning "something". Education researchers keep on saying that the agency of learning needs to be with the learner (e.g. Collins) but then when we think about evaluation, we find that the students are evaluated on what the teachers/researchers think they should know. Moreover, any kind of evaluation seems to be framed to ascertain how good the teacher was or the learning environment was, and this is known by the performance of the student on the evaluations. Does the student really need to know how good the teacher was? Let us argue that the student really gains from the evaluation as he/she gets a chance to measure his/her knowledge and then compare with others to determine relative knowledge or use the measurement to secure further educational opportunities (e.g. progressing through the grades, transfer from school to college, etc.). This notion of quantification of knowledge is disturbing because can the evaluator really know "everything" the student learned? The evaluations are mostly based on what the students "ought to know" by the end of the school year. So if the evaluators don't know what the students really learned and they evaluate the students on what they should have learned, is that a fair way of ascertaining which students are more intelligent than others (very often evaluation results i.e. marks are used to indicate the intelligence of the student)? Moreover, given that we know that every student is unique and internalizes knowledge in different ways, are standardized evaluations justified?

Suppose we do away with the complete system of evaluation, and let the students discover & internalize knowledge in their own unique way then how can we know whether that student can or cannot do a specific task later on in life (example write a letter to the boss)? Well, I would argue that this task later on his life also presents a learning opportunity and can be utilized as such. There is a constant push to prepare our students to face the "harsh realities of life" and we justify their schooling along that argument. Hence we keep on testing them to see if they are well prepared to move to the next stage in life and this goes on throughout the life. Maybe the "harsh realities" aren't that harsh if we stop thinking like that. But alas, the generation before the students were brought up thinking like that and so are the students now. They will do the same to their students and it will go on... Is it all in the mind? Are evaluations a way to know what's in the mind? Who's mind - the teachers or the students?