Tbh if you’re not a guy whos not full time doing web dev then you shouldn’t say that. I’ve known html since 1997, and basic js since 1999. It’s exhausting as hell to keep up with all the crap the field keeps making up. I just want a page that looks simple, neat, responsive and shows what I want my users to see. Bootstrap has been the only consistent thing that has allowed me to do that. It allows me to spend a day or half designing the page so I can get back to the data and the backend which is where the magic happens for most people.