> Requires the HP Smart app download.

To be able to scan your documents to your phone directly.

> Subscription may be required; subscription may not be available in all countries

For some advanced, Prizmo-like scan features and OCR which are probably cloud based.

> Get up to 5,000 pages or up to 2 years of pre-filled toner

Considering printers at same size provides ~3000 pages, that's good. 2 years is probably printing n 5% filled office documents every day or so.

> HP account required for full functionality.

For HP smart app and web-based functionality (like mail2print) to work, not the printer.

HP is still the best manufacturer which provides a complete driver stack which provides same quality printing in Linux. CUPS supports them in "driverless" fashion now, too.

I use an old HP 4515 web printer, which is the first generation of these devices. Many embedded web features are deprecated (like printables), but it still works great as a wireless, mobile enabled MFP.