I like dedicated GPS systems, but I would never buy one. In the world of Alexa, Siri, and Google Voice, the search assistants can all find you places with 1 button press to the Sena on your helmet or saying "Hello Sena" and a single sentence. "Siri give me directions to xxxxxxxxxx". She'll find it, route it, and open it automatically in the nav app.
GPS, only as current as the last software update when you connected it to your PC, or for some, via wifi to update. Phones...always up to date. 5.5" OLED screen is plenty visible, even in direct sun if you've got the colors in the apps set right, and the majority of recently released riding gloves are touch screen functional.
The only reason I'd but a GPS only GPS, is if it integrated all the things, making it more of a mobile automation nexus than a GPS. So, bluetooth to phone, accepts Siri/google/Alexa inputs with no user action required so the voice assistance can kick a destination to the GPS after a voice activated search, updates its maps through the phone, has traffic conditions and alerts, weather, connects to TPMS monitors, works as a gauge panel for the bike via ob2 connection, waterproof, and has a battery. I'd imagine such a GPS will be north of $500, so, that creates another problem, leaving it on the bike when parked.
I've never seen one with all of the above, but my phone does all of the above, which is why I thinks its the best GPS. Saving locations while on route can be done easily as well via voice and siri, though, I've never really found a use for it. Another nice point of using an iphone, is texting. If you get a text while riding, you can have siri read it to you, and voice compose a response and send it all without a single hand touch, and as the texts go back and forth, she'll keep reading them out to you.
THAT SAID: I get that some people prefer a dedicated GPS only GPS, phones do go full retard sometimes and do dumb inexplicable things that will leave your device in a non-responsive condition while riding, requiring a stop to fix the autistic phone and get it doing what it's supposed to do (hasn't happened to me in over a year though).