As someone who notices a lot of things, I was talking recently with someone who notices almost nothing. When I spoke about my desire to seek out the truth, they simply replied, "I just want to live a happy life."
There’s a perception that those who seek knowledge and truth are somehow less happy. Ignorance, and the willingness to take the path of least resistance, can be seen as an advantage for those who would rather not look too closely. Fundamentally, perhaps the difference comes down to red pill versus blue pill, and the illusions we’re willing to accept.
There's nothing wrong with being a curious or attentive person who likes to notice things.
What I often see, especially in the social media era, is people who are selectively curious and like to notice negative things. So they'll share lots of articles with titles like "The Amazon Tax", which I agree was interesting and informative, but they're not at all interested in e.g. "How Amazon Is Bringing Fast Delivery to Rural America" (https://www.wsj.com/business/logistics/how-amazon-is-bringin...). That's more of a problem, and I think it's what drives the idea that truth-seekers are less happy.
Enjoy your steak, Mr Reagan.
Except that this holds true for everything. For example, I only just today found out about this https://www.youtube.com/watch?v=r8yo7_Inikg&t=1157s, ie, Oracle's apparent complicity in genocide. Now that I know this, I now have to rethink things: what am I using that depends on Oracle that I need to migrate away from? This wasn't something I was concerned about just 24 hours ago. This is not to say it's not a valid concern: we should divest from companies and organisations complicit in genocide, but this is demonstrably a case where I have given myself more work, more worry, from gaining knowledge.
A lot of knowledge and truth can be quite disappointing. I do think shielding oneself from truths and knowledge probably would make someone more happy. Think about it - do you think you would be more happy knowing the darkest thoughts and actions of those around you? Of those close to you? What if your spouse was having thoughts of leaving you? Would that make you more happy or less happy? I suppose you could say that if you were privy to their thoughts, you might discover that they love you and think about you more than you imagined, so that may be a net benefit, but I think we humans have a tendency to focus on the negative, and so an abundance of information leads us to focus on the negative things within the information, which makes us less happy.