In my personal opinion, we can pay attention to the tone collocation of poetry, but we don't have to obey any rules deliberately.
Poetry, originally not written into law, is a summary made by poetry researchers since the Tang and Song Dynasties, and it was not perfected until the Qing Dynasty (but it was also rigid). Poetry reached its peak in the Tang Dynasty, but there were many "deviant" poets in Tang poetry, so someone invented the concept of "difficult to save" to attach to it. Nevertheless, there are still a lot of Tang poems that can't be deviant, such as Li Bai's poems, not to mention Cao Zhi's poems before the Tang Dynasty. What is true is that it is absurd that the predecessors have poems first and the descendants have rules to follow.
In short, it is right to pay attention to tone collocation when writing poetry, so that you can read it well, but it is wrong to deliberately abide by any meter-but it does not rule out that some poets have superb skills in using words, and they can also make good poems under such restrictions (belonging to the poet's works, not to the meter). The artistic expression of the latter is similar to adding the tone of "rushing to Sichuan" to any poem.