SEO disadvantages of moving a blog to a subdomain

In general Google treats subdomains as separate sites.We recently move blog to subdomain and here the issue we are getting

Disadvantage on subdomain

• A subdomain works like a separate domain in terms of authority, you would have to spend more time and money for building the authority for your root domain compare to when the blog was under a /subdirectory/ or on /separate-pages/.

• The strength of the root domain does not transfer to the subdomain. The existing authority of the domain does not affect the subdomain and you would be starting from scratch.
• results in better root domain authority
• You have to perform separate SEO activities for this sub-domain.
• Subdomains are useful for audience segmentation as well.
• Subdomain is an advantage if your main domain is already ranked well for your targeted keywords because your subdomain has a separate opportunity to rank and therefore give you a greater share of that valuable first page of Google real estate.

Advantage of subdomain

• The advantage of having sub-domain is that you can target specific audiences with specific sub-domains.

• File system and database are separate from main website
• If you are planning to follow a corporation structure with multiple sub-enities under one umbrella, subdomains work for you.
• If for any reason, your sub-domain is penalized, you won’t get any problem to your main site.