This problem is not a problem. Poetry usually refers to metrical poems and metrical words. Of course, we need to pay attention to metrical words. Both ancient poems written in ancient sounds and modern poems written in modern sounds should be written according to the rules, otherwise they can't be called poems.
The original intention of the questioner's poetry may refer to other modern poems besides poetry, right?
Whether to pay attention to the rhyme of flat and even words depends on the different types of poems. To study this problem, we must first classify poems. There is no official classification of modern poetry. I think modern poetry and prose poetry are two categories. Among them, most of the poems that rhyme but don't speak flat and level are not officially named. For the convenience of explanation, let's call it "regular poetry".
Now you can answer the question of the altar master. Modern poetry must obey the rules; Prose-style new poetry has no judging standard, so it is not necessary to pay attention to flatness or even rhyme; Rhythm poetry needs rhyme and rhythm, but poetry does not necessarily conform to the level.
Rhyme is the spontaneous creation of the masses. It not only has the advantages of free form of new poetry, but also inherits the advantages of rhyme and rhythm of metrical poetry, which is a combination of the two.
Respect the past, don't forget the past, keep the original and open up new ones. Rhythm poems don't talk about tuning, which is the natural rhythm of modern spoken language and can be fluent without special training.
The above is my personal opinion. Please discuss criticism and distinguish right from wrong.