Absolutely. Going this route you start with the quality of bike you want. You know where everything is and what it does. You can fault and repair yourself. With a hub conversion all individual items can be replaced should they fail. Should the bike itself fail the kit can be moved to a new one. Battery can be re-celled replaced as needed.Perhaps you are looking at this from the wrong side.. A really good bike that you like can be converted to an e-bike . Bike conversions are much nicer these days so are not necessarily a hodgepodge of cable ties and sticky outy cables so it worth considering, especially as once along this path upgrades and repairs should be fairly simple.
Try that with a Bosch powered mid drive or other machine with locked in software/parts supply.