Is bad texter a thing?

Or do people just not care? My bf is the worst texter in the world. We are totally fine when we are together but him not texting or his texting style has led me to believe so many times that he is about to break up with me or just doesn’t care. Then we meet up and I feel crazy for reacting that way because he’s great in person. He would rarely say something first unless it’s a productive thing like - let’s meet at 8 not at 7. If I text something funny, he’d check his phone an hour later and write just lol. A few times I would tell him something important like - my visa didn’t go through. And he would write - I’m sorry, something will come up. Once I got positive medical results that I was anxious about (my HPV cleared on its own) and he wrote - awesome. I was so mad that day and we had a bad fight that he had no reaction, but he says that’s not what it is and that he just doesn’t like long sappy texts. He sometimes has to go on a business trip that’s a week long and he’d go 3 days without texting at all. I let him be a few times just to see how long he’ll take. It’s beyond ridiculous to me. A lot of times he’d ask me something and when I reply he leaves me on “seen”. Or say - ok. Just fucking ok!!! What is even that? It’s not a word. When I say this bothers me, he’d then consciously try for like a week and then forget again. I seriously don’t know what to do anymore with this. It’s so frustrating all the time. And exhausting.

Edit: Thank you all for your advice. But see, the thing is I don’t expect texting all day, I don’t even expect an immediate reply, but there are situations that require more than two words at a time or just an ok. I think that not talking for 3 days is not normal either when you’re in a committed relationship. Saying- hey, have a nice day 😘 in the morning would be enough for me. Just that one text. Not saying anything sends me into anxiety the entire time we are apart. Not to mention if we are fighting, he disappears off the face of earth. I have a busy job too, but the way I see it is if I have the time to check social media, go to the bathroom and eat, I have the time for one text. It can be in the morning or before bed. Or a call if easier. I just don’t think anyone is so busy. But that’s just me. You’re right. I shouldn’t try to change him. And I won’t anymore.