Lots of people have already said it on this thread OP, and I'm sorry, but I think you are entirely missing the point!
Reading schemes are important because they allow children to work on the phonic knowledge they are building sequentially. Proper phonics reading schemes (not older, re-categorised books, or bloody Peter and Jane) are designed so that children will have the knowledge to read the entire book when it is given to them. It is important for practising those decoding skills and boosting confidence that they can read a whole book. They are a tiny, tiny, tiny part of your child's "reading" experience though. They read them in school and then bring them home where you can add a few more minutes of this practice to supplement what they have at school. Remember that young children still learning need support to read. With 30 kids in a class there is a limited amount of 1-1 reading time in the school day. I think it is reasonable for schools to send books home for you to do a bit more. But it's not compulsory. Just like anything else, reading is a skill, and more practice will improve it, faster. So no, I'd not veer away from them.
BUT - reading scheme books are for exactly that. Practicing the skill. They should not be the only reading you do with your child. We spend a few minutes on the school book each day and then many times as long sharing other books. Some of these are also books my reception child can read (often "easier" ones than his current school reading book), but I also read lots to him. Sometimes we do read more difficult books together, where he will read a couple of pages which contain words he can manage and I fill in the gaps. But this type of reading is "for fun" as I don't expect him to be able to develop good reading skills from only reading some words - which is what happens if he has a book above the level of phonics he is currently secure on. The only book I can be sure match his phonics knowledge are... you guessed it, reading scheme books!
Yes, lots of them are dull, but that in itself is s learning experience. My son has raced on with reading because he wants to be able to read the more exciting things I currently read to him. Understanding that it's necessary to develop his reading skills using the less interesting books is a big motivator.
FWIW, we're currently on some Nelson Thornes Sound Start books from school, which I'd never heard of. Some of them are very good. My son particularly enjoyed one about a flying bed!