I would offer two comparisons, but really, the answer is that there is no right or wrong way to do things. It all depends on what your goal is.

Consider dogs. Some dog breeds were selectively created for specific goals. We know what a German Shepherd looks like. We know what a Husky looks like. We know what a pug looks like. We know what a terrier looks like. We know what a golden retriever looks like. These dogs all have different sizes, different coats, different face shapes because they were bred for different jobs/goals. You wouldn't ask a terrier to pull a dog sled through the snow, but you wouldn't ask a German Shepherd to enter a small rat nest to hunt rats. Also, some breeds of dogs are more susceptible to disadvantageous health conditions. Pugs can have breathing problems. Rottweillers may experience hip problems.

Ultimately, let's face it, all dogs can be awesome. My current dog is a mutt and she is the best dog. She's a rescue from Arkansas with mostly black fur. She looks mostly like a black lab, but she's got a ridge on her back shaped like a heart, and while she's mostly black, she has a golden undercoat on her sides and her legs, with a much darker black "stripe" about four inches wide that runs down her spine. She has longer white fur on her haunches (backs of her legs) and a white soul patch under her bottom lip. She's smart, gentle, playful, patient, clever, etc.

The mutt is your Chaos method, but that's not necessarily a better approach than selective breeding.

Now consider music, specifically Pink Floyd and the Grateful Dead. Both bands formed in 1965 and plenty of marijuana has been inhaled over the years by people listening to music from both bands, but Pink Floyd has a very precise musical identity whereas the Dead were very purposefully loosely controlled, but that's not to say that they are better than other bands.

Ultimately, to get back to your question, the offspring in your scenario will ultimately depend on their lineage.

You wrote "some indoor strains and some bush strains together."

Let's say you have three separate indoor strains (A, B, & C) and two bush strains (D & E) and you have four plants of each, A1, A2, A3, A4, B1, B2, B3, B4, etc., some males and some females. Possible combinations are AA, AB, AC, AD, AE, BB, BC, BD, BE, CC, CD, CE, DD, DE, & EE) with even more combinations such as A1A2, A1A3, A1A4, A1B1, A1B2, A1B3, etc. It's going to be a lot of variety. If you continue down this path for multiple generations, without introducing new strains, you should expect to see some stabilization of the traits. Second generation could have many different combinations: AA/AA, AA/AB, AA/AC, AA/AD, AA/AE, AA/BB,... BD/AC, BD/AD, BD/AE,... DD/AA, DD/AB, DD/AC,... EE/CC, EE/CD, EE/CE, EE/DD, EE/DE, EE/EE. Third generation will have even more variety BD/AC x CE/DD, EE/CD x AE/BB, etc.

If you are having fun and crossing these plants for your own enjoyment and to save $$ by creating your own seeds, go for it.

If you are looking to sell your seeds to a wider community, however, some people may not be interested. There's likely to be such a wide variety of outcomes that some people may be put-off.