A discussion about Treasure Chests

As we all seen, Bloodstained: Ritual of the Night Demo presented us with chests containing itens. This is not a new idea on Castlevania series and on Igavania series as a whole, with varying usages.
I want to open a discussion about how Chests could work on the game, and how they worked before.
Order of Ecclesia can be used as an example, since part of Bloodstained is based on that game.

HOW CHESTS WORKED ON CASTLEVANIA: ORDER OF ECCLESIA

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Wooden Chest:  respawed when re-entering the area. Had random common itens and 10% chance of being replaced by Green Chest.
Green Chest: respawed when re-entering the area by replacing wooden chests (10% chances, as i said). Had random rare itens.
Red Chest: these chests were fixed at specific locations with equipments or power ups (like Max HP up and such) and never respawed, remaining open.
Blue Chest: exatly like Red chests, blue chests had specific itens and they never respawed, remaining open and they were ultra-secret. You needed to crouch on a specific place to make it appear, or beat a boss without taking damage.
Golden Chest: rarest chest type, the game had only three, and each one had a relic, a magical item that gave your character special progression abilities.

Also, wooden and green chests had a pre-made set of random itens at each map, since 60% of Order of Ecclesia is played outside the castle. So, at a forest, wooden chests and green chests could only give specific itens at random, while at a Haunted house, they had a different set, and so on, forcing the player to re-play the same areas coutless times, if the player wanted some specific item only found at a specific type of chest at a specific location.


WHAT KIND OF CHESTS BLOODSTAINED: RITUAL OF THE NIGHT DEMO HAD AND WHAT THEIR TYPES WERE

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Wooden Chest: Potion, Ether, Leather Breastplate, High Potion, High Ether
Green Chest: Long sword, Headband, Kung-fu Shoes, Ring.

 WHAT WE CAN LEARN FROM THIS

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At first, we can say that Wooden chests will contain, mostly consumables, like potions, probably "common itens", but there is a Wooden Chest with a Leather Breastplate, so, that breaks the line of thought. All Green Chests had equipment.

I have a suggestion i wanna give to open-up the discussion:

MY SUGGESTION ON HOW CHESTS COULD WORK AT BLOODSTAINED: RITUAL OF THE NIGHT

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Bloodstained: Ritual of the Night will be a game with a single, huge castle, not separate areas. Even so, the game CAN have chests giving random itens and respawing and i think Order of Ecclesia system could work wonders to increase the game's length, even if it sounds like copying and pasting the same idea.
Maybe each chest can respawn after the player leaves the area and stays out of there for a random amout of time between 1~5 minutes or something like that.

Bloodstained could have 4 types of chests, as follows:
Wooden Chest: gives random common consumable itens (forging materials, quest itens and potions that can be bought at game shop or found at enemy drops) from a pre-made list of that area. All "chest spots" at the game (excluding Crystal, see below) are wooden by default, and had chances to turn into green chest when the player enters at an area.
Green Chest: gives random random rare consumable itens (forging materials, quest itens and potions that CAN'T be bought at game shop and are rare enemy drops) from a pre-made list of that area. 
Wooden chests have 20% chance of turning into Green Chests when the player enters at the area.
Blue Chest: gives one-time fixed itens. They are mostly hidden. Do not respawn.
Crystalized Chest: a chest inside a crystal pillar, or crystalized on some stylish way. It must be broken and it contains a Shard. Do not respawn. (Plot idea: the alchemist guild forged Shards based on demon's powers, and those Shards can be found at crystalized chests, since Gebel's Castle was raised where the guild was).

CLOSING COMMENTS AND QUESTIONS

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So, i want to know from our great Bloodstained community:

HOW CHESTS COULD WORK AT BLOODSTAINED: RITUAL OF THE NIGHT? HAVE ANY OTHER GOOD IDEA? THE GAME EVEN NEEDS CHESTS OR THEY COULD BE REMOVED ENTIRELY?


That's all folks!

A side note: take a look also at my other thread: A discussion about the future in-game Shop