Luca,
IPS is still the preferred choice for forums, so your question comes up quite often in entrepreneur groups I belong to. Folks understandably want to learn one platform instead of two, if possible.
Luckily, there's an easy answer.
Wordpress is the standard for blogs. The platform is the CMS of choice for an ever-growing number of businesses, small and large.
At times, Wordpress is a challenge in terms of security, backups, caching and hosting. But it is a well-supported platform that continues to get better and better for its users.
IPS is at least 15 times (maybe 20) times more difficult to use. Also, and you probably already know this, but if you're self hosting (not using paid IPS cloud services), asking for help in any way is met with extreme resistance and almost outright hostility. The message is brutally clear. I finally just hired a developer to handle the IPS side of things. Life is too short to fear asking questions about a service you pay for, right?
So no, you absolutely do not want to use IPS pages as a substitute for a Wordpress blog. You'll be posting routinely and want a user-friendly platform like Wordpress.
Use IPS only for forums, and possibly the gallery if integrated with your forum. This is critically important if you're self hosting. And this is just as critical: be prepared to solve ALL problems and have ALL questions answered by someone you trust - who is an advanced PHP developer.
Just my two cents.
Best of luck to you.