Process text to do what exactly? Computers are good calculators. You can do calculations to check if a point in euclidean space is bounded within a known volume. Or do calculations to obtain the probability of something happening.
Statistics have a margin of error. Errors can be compounded. A concatenation of trivial snippets based on the probability of them forming a sequence is error compounding, propagation of uncertainty. You end up with a pile of crap. The only thing you can do to mitigate that is using an enormous number of samples to lower the error up to a limit. That's inefficient.
But LLMs are even worse, because they work at token level. Error propagation is greater, so you need even more samples to keep gibberish from happening too often.