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bybell
All of those were published in 2010-2011 and use Yale. Yes, they've all been around in various versions for a while.
Yale has been the most successful Cantonese Romanisation scheme for the longest span of time, so it's likely still employed for the sake of legacy in many study materials, as you've shown. My personal feeling is that Yale has outlived its useful life, and that Jyutping and HKIEd are the present and future of Cantonese Romanisation. This is why I discourage new students from learning Yale at the expense of Jyutping or HKIEd. Of course, it doesn't hurt to be familiar with it later on.
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bybell
For serious students, a good grasp of multiple romanization schemes is essential in the long run. There's no way around it.
I agree with that insofar as I believe that serious students should learn both traditional and simplified Chinese characters. It's certainly useful since it drastically increases the amount of learning materials at the student's disposal, but it's debatable whether the extra effort is, or should continue to be, necessary.