"Reimagined with Liquid Glass, macOS Tahoe is at once fresh and familiar. Apps bring more focus to your content. You can personalize your Mac like never before. And everything just flows into place."

what is this grammar

It's Apple house style. Marketing writes in tiny sentences. Even fragments. Makes the copy more punchy. And it's been like this for decades.

I think this is just 'sales writing'. As if written for a trailer video.

Now imagine it being said by someone presenting and doing the same hand pyramid stance that they make every Apple employee in WWDC videos do.

All kidding aside, it’s weird to read. Ever since I was a kid, I was taught that beginning a sentence with “And” or “But” is not “correct”. Times change and all that, I get it - it’s just weird though.