Is this stupid for SEO?: Blogging about subjects not directly related to your products?

I run a company called Next-Level Artwork where we sell posters and canvas art. Naturally for an SEO strategy, you might think: Blog posts about matte vs gloss posters; interior decoration tips; fun facts about famous artists—everything you'd expect a conventional artwork site to blog about, basically.

The thing is, blogging about those subjects bores me to tears. Like, shoving my head into a meat grinder level unbearable.

What I've started doing is only blogging about subjects I'm super passionate about, which generally revolve around: business, entrepreneurship, self-improvement, personal productivity, time management, things of that nature.

In those blog posts I relate it to the business itself, to what improvements are being made in the business. It's not just like "Way To Be More Productive" and there's zero relation the company or the products leaving people scratching their heads. For example, talking about the importance of not checking e-mail or social media all day but instead batching these to one session per day -- but relating it to my experience in running this business, how it's allowed me to focus on other areas of the business that are more important, etc.

So I guess my question is, to put it bluntly: Is this fucking retarded? For SEO blog posts to have value, do they need to be the sort of "conventional blog posts" you'd expect such a company to write about? Where it's like: "Ah yes, company X sells posters, and they're publishing blog posts about posters. All is good."

Because I just won't have the motivation to write blog posts like that. I've tried it and it's just agony. It takes way longer than it needs to, it's excruciating and I'm like "When will it end?" First world problems I know, but if that's my option, I'll just find a different way to spend my time where I enjoy the work, instead of this grueling slog writing long-form posts about stuff I frankly don't care about and that bores me to death.

So really my options realistically are: Take this approach, or just abandon the long-form blogging until I can hire someone to do it for me.

So my question is: Is there still SEO value to blog posts that may not be directly relevant to your products themselves, or your industry itself -- but still discuss your company in a more indirect way, where it's like: Ways we run this company more effectively; strategies that have helped us to manage our time better in running it; advice on improving your personal effectiveness, and examples of how it's practically applied in running this company; etc.

The reason I ask is because, it feels kind of stupid. I know that I'm making them relevant to the business in those ways, but just seeing blog posts on time management & entrepreneurship on a site that sells posters & canvas art, it feels kind of dumb. And may be of dubious SEO value.

At the end of the day it's my company and I can blog about baseball players or gay porn for all I care (what am I gonna do, fire ME?), but I'm just having doubts about whether it's even worth taking the time to do this, from an SEO perspective, and if the posts would still have SEO value. Entrepreneurs and people seeking self-improvement advice need posters too ya know! I'm just having doubts as to whether it looks stupid, and might be irrelevant from a SERPs perspective due to the lack of 100% relevance to our products themselves.

Your thoughts?