Other than being OS, cheaper... For the consumer do they need to know that it's risc v? Would a laptop instead of saying "Intel" or "ryzen" it would say risc v on the sticker... Otherwise it's still windows or ChromeOS?
Beyond just building against the android runtime, it is now trivial to support additional architectures at every stage of the pipeline, even for native code.
Although x86 has the advantage that all dev workstations use it for VMs, at one point Google even had a MIPS version of the playstore, not to mention how different V7 and V8a are within ARM architectures.
Mine is based on ARM
You wouldn't see riscv on the sticker the same way you don't see x86-64 or arm64 on the sticker.
Your laptop or desktop might well have RISC-V cores in it already. They are present in at least WD drives and some nVidia GPUs. But any time you need a cheap embedded core and don't want to pay licensing fees or deal with contracts is a case where you might choose RISC-V.