@kannazuki
I apologise if I make manga sound inferior by omitting any compliments on the medium, because that is not what I mean. I do agree manga and anime have their own way of portraying the same event. Furthermore, it is usually true that manga is drawn so that each key frame is allocated a valuable panel. And before I go on, I do believe ultimately to each their own; it is a fact that some people cannot process one medium as well as another. I may have chosen the wrong word by saying "emotion" in my last comment, what I really mean by emotion is something more elaborated and grey-shaded than what you definitively see in manga.
While the so-called 'transition frames' in anime 'water down' key expressions, manga works in a way that the so-called 'unnecessary frames' are taken out and is thus 'watered down' in a sense. The former is giving you extra information, some of which may not be considered as important as the other, but the key frames are still there; the latter is giving you the specific information, while all important, they do not tell you when a character blinks in between panel. In anime you may be experienced enough to allow yourself to selectively intake information, choosing to value key frames only and, in effect, nothing is watered down. Though I may sound pedantic, I fully acknowledge that in some anime such as SnK, even a blink from a character is solidly reasoned. As a hoarder of information, the reasoning behind a blink is the extra bit of presentation I take to heart. The same logic applies to how the background music is expertly positioned and aligned with certain frames and dialogues. These are often overlooked and under-appreciated, but every single decision is a result of carefully planning. In turn, this 'planning' contributes to the full message of the certain scene, as interpreted by the staffs.
Manga indeed gives you the freedom to interpret the scenes however you want, but that does not mean a gain in information. The extra dimensions are only allowed in the form of 'potential,' but they are ultimately generated by your imagination. On the other hand, the anime has already produced a whole set of interpretation for you. The extra dimensions are not so much as 'potential,' but comprehensively produced and presented. These include music, sounds, tone of voice, pitch of voice, length of words, emphasis on words, colours, time taken for actions etc. While some may not like the fixed set of interpretation, the reasoning behind each and every frame is real, no matter how 'disagreeable' or 'cheap.'
Finally some of my personal experience, I cannot count how many times I fail to guess how quickly a character turns their head around. Sure it isn't as important relative to panels before and after, but I believe the speed at which they turn their head around is partially reflective of their mood. Whether there are implications in panels before or after, the fact is, that piece of information is missing from the manga. Anime is an adaptation of the manga, and the interpretation in the speed of their turning head would be at the discretion of the director. Leaves no room for neither your imagination nor other interpretations, yes. Gain one set of solid insight into that scene, also yes. Manga is inferior in giving a full physical description, that part is undeniable. (Potential for interpretation is not a description but a suggestion, in which anime is inferior for allowing potential since everything has been fixed; the scene will be fully acted out in the anime while dismissing your imagination, because this isn't where your imagination is needed.) But I'm making it clear that manga is not inferior in story-telling, since this aspect is not something you compare. And also of course, from an artistic sense, the fact that these extra 'information' is missing does not disrupt the main message a scene in manga tries to express. If I submerge myself in artistic reasoning, then the passage above should have nothing to do with me.
(P.S. In terms of missing information in the anime, the one thing that always gets at me is those "......" speech bubbles because they can't really be sufficiently defined. There's always the difference between "..." and "......", treatment for these in anime are often overridden by things that are actually 'happening.')