Why you cannot keep bonsai trees indoors

Well, I live in a tropical country, which means high humidity, no cold winters and plenty of natural sunshine, even indoors if you have a big window or a balcony.
I have lived in a flat for many years, growing bonsai inside.
Once I got a proper garden outside, the very same bonsai that were struggling indoors, began to thrive.
The main reason was that inside I would water less, spray less fungicides and insecticides, use less fertilizers because of the furniture, wooden floors etc. and of course, lack of wind. And dew. And polinizers. And one of the main problems was the constant temperature inside, with no big difference between day and night, which seems to have a huge impact in the overall way plants like to grow.
Now they are outside, and surprisingly I work much less trying to keep all of them alive. In fact, even if I don't care at all for two or three months, just watering them, they do their thing and grow.
So to summarize: there is no such a thing as "inside bonsai", it's just a trick to sell more tropical saplings to newbies.
 
There are ones that can be done. Good light is critical. I also keep my place relatively cool. Never trees from a temperate climate unless they range into the subtropics. Mine I bring indoors so they have a huge advantage being outside once it warms up. Mostly in full sun. So they can store up energy for the lean period. Podocarpus, pomegranate, serissa and Montezuma cypress are my examples.
 
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