This may shock you, but there remain some of us that steadfastly refuse to use D&D Beyond and/or have an inordinate love of books.
I buy both. I love the physical books because they are beautiful and I like to sit without electronics sometime and page through a book.
I like D&D Beyond because I can have my entire D&D library in my pocket in an easy to read, easy to search format, cross-linked, and off line.
I am very much likely the current thematic, modular format. Just got
Ghosts of Saltmarsh and it is such a great value for me. Same great quality as most of the other 5e books. LOTS of adventure content that can be plopped into any campaign or one as one shots, like
Tales From the Yawning Portal, but more fluff to tie them together and run them as as a campaign. Like the other adventure books you have your campaign/adventure specific creatures and magic items at the back.
The nautical rules are very well done. You don't need to use them. You can stick with what is in the DMG. These just give more options. A subsystem for ship combat.
I was also pleasantly surprised at all the material for ocean terrain and encounters, including a number of well designed locations that you can throw in during travel.
I'm so much more happier with this format than I would be for lots of splat books.
A rules compendium would be nice eventually, but I don't know that I would buy it as I have D&D Beyond. Maybe a beautiful 50 year collectors edition. Compendiums suffer from the issue of getting out of date, unless the game becomes static. If you wan't all the rules in one place, and up-to-date, digital is the way to go.