Let's break it down step by step:

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

I propose that;
1. The newbies should be restricted to posting only in Beginners and Help Board.

No. Newbie restrictions and a newbie jail is not welcome. Everyone should be allowed to post anywhere they want if this forum is to keep its importance in the future.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

2. However, newbies should be allowed to read in all boards for learning purposes.

The forum allows you to read its content even without being logged in, so the rank doesn't matter.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

4. Every newbie should remain in this status for a period of 90days. After the expiration of 90days, the forum moderators shall examine the performance of every newbie, then immediately award a certain number of merits(Let's say 10, 20, 50 etc) according to the performance of the newbie in this 90days orientation period. Also place the user in any rank other than newbie according to the performance aswell.

This is a discussion board. People are not applying for a visa or studying for their master's degree. Who would be interested in going through all that to become a member here? The moderators have enough to do without giving them the task to check the post quality of each and every newbie. All members (no matter their ranks) should get merits in the same way: Based on the quality of their posts.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

Pros:
If this is implemented, we could have the following results
1. The rate of spamming will reduce drastically

In other parts of the forum, yes, but it will increase in the B&H board.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

2. The rate of plagiarism will reduce aswell.

Limiting newbies to the B&H board wont reduce the number of plagiarized posts, but it will make them easier to find.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

4. This will help guide users on which boards to post, most often you will see a newbie posting a Beginners and help post in meta.

Such posts can be moved to the appropriate sub-boards. What if the newbie posts in a foreign language, starts a discussion about an altcoin/ICO, starts a scam thread, etc. All those would go in B&H as well?

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

5. This will reduce the amount of none quality posts

Highly unlikely.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

6. It will also reduce off topic posts.

It will increase off-topic posts because all threads by newbies will be posted in the same sub.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

7. It will encourage the newbie to research and have good knowledge of the forum and Cryptocurrencies at large in order to be awarded higher merits and promoted to a good rank after the orientation period.

it will result in newbies no longer being interested in joining Bitcointalk and spending their time elsewhere.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

8. It will ease the moderation of the forum.

Newbies aren't the only ones that need to be moderated, all members do, including legendaries.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

9. The discusions in the rest of the boards would be interesting, technical and quality .

A higher rank does not equal greater competence and technical knowledge. Many high ranked members got their merits airdropped and didn't earned them by being merited by other forum members.

Quote from: KingsDen on June 14, 2021, 08:49:35 AM

Cons:
1. It will limit the chances of a user in a campaign to complete his/her weekly task. However, I don't know if newbies involves in campaigns or not.

The admins don't care about the bounties and signature campaigns members participate in.