A solution that doesn't change the rules was given. That suggests to me, preference aside which I cannot argue against, there is no issue with this aspect of the class feature.
The problem is, it's a solution that--in the context of this thread--only fixes the "problem" for the one person who
doesn't have that problem to begin with. That isn't a solution. Even Pukunui, who you cited as part of your "solution," notes that he continues to dislike the power as written. Part of your solution, in terms of process,
is exactly what makes the game less fun for my DM. The other part is largely what we have been practicing, but its only working because, if I accidentally step outside my DMs comfort zone, I have already expressed that I will not be bothered by any alternative process of adjudicating the ability. That isn't what is written in the books, so again, your "solution that doesn't change the rules" isn't working for anybody but you in this thread...
My goal for this aspect of the thread, at this point in the discussion, is to examine what specific ways others play the game or other DMs run the game that make the power problematic for you. As I have noted in other threads, I'm interested in how others play the game. That's why I run so many pickup games, watch actual play videos/podcasts, and engage in discussions as to approach. This class feature seems so innocuous to me based on my experience with it (four different players of UA rangers) that I'm wondering why I'm getting a different result.
If your goal is to find out how and why other people play the game the way they do, and what makes elements of the game problematic for them, may I suggest that you stop trying to tell people who are giving you that information why it isn't actually problematic for them. They are likely to stop giving you the information you want if you do that, which will be counter-productive to your stated goal. It is problematic for them. If it wasn't, they wouldn't say it was. Whether you agree with their reasons is irrelevant as to whether it is problematic for them. Their core values don't need to match yours. As to why you are getting a different result, it seems to be because you hold a different set of pre-positional values. You think it isn't a big deal for people to jot down a few notes based on the data they give the ranger and to modify their plans as a result. They find that doing so makes the game more tedious and less fun. You think its totally cool that the power obviates certain challenges instead of providing benefits to them. Other people find that less fun. You think it's ok that a resource free 3rd level power is a much more potent version of a 4th level spell. Some people don't. Given those differences in values, you are going to evaluate the result of the mechanic differently.
How much of this do you suppose is just fear of something on paper that doesn't amount to much in play? I know I reserved my review of the UA ranger until I had seen it in play. A lot of other posters just started reacting or theorizing.
Honestly, both my DM and I are or were really worried about coordinated attack. Yet, we plan to use it as written to see how it plays out for ourselves. (Moreover, I am a little less worried, as the modifications I need to make to my playstyle in order to avoid stepping on the toes of the cleric will end up drastically reducing my actual as opposed to theoretical DPR. Likewise, if I wasn't worried about our cleric getting annoyed, then the overall group action economy that is keeping my current playstyle going is lowering our overall group DPR virtually as much as my beast is raising it. I think coordinated attack will continue to play into my observation.) My DM is worried about some of the higher level abilities that don't bother me at all. He is still willing, if we ever end up playing that level, checking out the way they work for himself. Even this ability, which he has warned me might not always work as per the rules as written, has up to now. Do some people jump to theorycrafting fears? Yes. I don't think that is the case here. The power is ripe for abuse. The only thing that hasn't made it a pain already is that I am not trying to abuse it. Making it less ripe for abuse is all people want. Because, sometimes, constantly trying to ward off potential or accidental abuses makes the game less fun in and of itself. Using the ability is less fun for me
because I constantly have to worry about making the game less fun for my DM. I see that as an issue, and I don't see it as being his fault.