Why one or the other? Why can't it be a 'software' thing? Like, your psychology having an effect on how deep you go?

I have noticed that 'keeping it together' and 'letting go' have an immense effect on how deep trips lead. Arousal, brainwaves and all that. Once after a whole workday spent on LSD, working, mind you, having meetings, managing a team (a lovely experience, I wholeheartedly suggest it to anyone who likes acid - and their job), 12 hours after taking the dose, I was making out with my partner and I was suddenly in LSD space dissolved, feeling like a part of her.

Also, why can't it be multiple levels at once? I mean, consensus reality in some way 'symbolizing' or 'mirroring' a higher level of existence? I'm not saying it is, just saying it could be... So it's not 'one or the other'.