Regarding brackets, where do you place modified precons with cards from the same set?

Hello everyone. I have been thinking about this topic recently, trying to improve the way I think about some of my decks for pre-game discussions.

By now, is clearer for more people that placing a deck in a bracket goes along with the intention and desired experience. But as bracket 2 is commonly referred as "precon level", I wonder if some players may see fair or unfair a modified precon with few changes.

It is also pretty common to see precons with a subtheme that doesn't fit well, and then see very very obvious swaps you will like to do with cards from the main set (of course, this will move players to seek those cards, sell packs, etc). And many players like to keep thematic decks, so cards from the same release are nice fits while still restraining how much power you can really add.

So, what would you personally think about those decks? Will it depend on the amount of modifications? On the quality of the cards being added? Do you have decks like this?