Being a Sage DB and Niche owner I often sit back and think the same, in that would I be able to notice an appreciable difference if I changed it to one of the chrome clad beauties I see on here, owned by those who really know about coffee and can appreciate and detect the nuances in taste from one bean to another.
However, it has also never ocurred to me that having a seperate boiler which is designated for steaming and as far as I am aware is not connected to or how the other boiler produces hot pressured water to the grouphead could affect the taste of the espresso. I put that solely down to my shortcomings and not the machines. Therefore, for me having that extra boiler for milk frothing duties should I ever need it, is simply a bonus.
I will admit, if the other single boiler machines out there owned by many on here allow more ‘tinkering’ ‘profiling’ and all that jazz, allowing you to experiment more or even if that can help you achieve coffee Nirvana for your taste buds, then yes go for it.
What is surprising for me, is how many on here who are non-Sage owners that recommend you stick with it. Which to me, means whilst yes it is more of a consumer product that may or may not last as long or be as easy to repair should anything go wrong than its chrome cousins, performance wise it must be pretty good. That means I really don’t need to keep scratching that ‘what if’ itch and just enjoy the coffee.