If you are among one of the last to check-in or you need to be guaranteed to sit together, then I can appreciate this sentiment.
"If you don't pay, you get the luck of the draw." But there's luck no longer.
Ryanair are intentionally and maliciously ensuring that every reservation without paid seats is split apart as far as possible, regardless of how early you check in.
The airline provides you with a seat to your destination. If you want to sit together you pay its simple. I want to sit with my partner on an Emirates flight to South Africa and they charge me.
What makes the British complain so much about everything? Radio 4s listeners branded them 'biased and unconventional'. Ryanair bad, Easyjet good, the whinging makes me sick.
If you want something to complain about, see what Brexit has in store for you with your future seating plans.