Keeping a Cart' intact is always an under-the-surface worry; it requires a vigilant attitude when working with them, and best to keep a boundary that prevents the uninitiated from getting too close.
I know this well, as my Cart' is a one-off design; having it repeated also looks at the current time as a non-option, which does not leave me with a comfort zone where my future needs are being thought through.
For Phon's; keeping one's eye firmly fixed on a particular design will keep their attention of other designs that might be a better synergy in the home system and could be one that becomes wedded to for the rest of their time.
I strongly suggest an open mind and plenty of experiences during the time one id sharing time with a model selected and in use.
Putting other owned audio equipment into a better to understand context.
I have used the same ESL Speakers as the main speaker in the system from the mid 90's until the Xmas break of 25/26. I have used the same Power Amps in the system from the early 00's, and these still remain currently and will only be replaced when too much to work with; they are young men's sport. The CD Source has been the same for 10-ish years, and this is the first CD Source used in the system.
Only Phonostages out of all the demos of audio equipment I have received are able to, with immediacy, influence an end sound and subsequently prompt decision making. When the end sound is right to the individual, it is right, and no other is going to dictate a different outcome. The rights for this individual were not found as an off-the-shelf product, but created by the hands of time-served electronics engineers, all of whom have the Vinyl Source as their passion for audio.