I have an aversion to it personally, but that's just me.
1 large fish group per tank.

Too many large fish types, starts looking more like a zoo, not like something one might see or think of in a natural setting.

Stick with one or the other, not both.
You can still have lots of species but things like plecos,
Various small schooling fish, Apistos etc, things that are more suitable and make a nicer community and look in the tank.

Once you buy a group of fish, few aquarist will remove them if they do not really fit in their tank the way they'd hoped.

So give this a lot of thought, more than about anything else.
The hardscape, the placement in the home and fish choices are the hardest.

Regards,
Tom Barr