When you’re trying to make a mass-market hardware product at bare-bones pricing, you have to be ruthless about simplifying the hardware and cutting costs. A single SPI chip isn’t a huge investment in absolute terms, but it adds one more sourcing complication (in the middle of a chip shortage) and creates significantly more RMA complexity (for the reasons that the Pine64 organization accurately explained from their past experience) to cater to a relatively small number of users.
Contrast this with the Raspberry Pi organization, which has seen massive success by having an uncompromising stance on simplicity and focus, even if the ideological purity of the project isn’t up to certain people’s standards. Like it or not, it’s what made them successful while projects like Pine64 continue to be niche products that require a lot of work and research to use.