Looks like Win install is self-sufficient and can create the needed partitions. As a rule, I do my own partitioning, since Win install will create the Win RE (Recovery Environment) partition, which is useless when I'm handling my own backup/recovery. I also disable UEFI on my boxes and use MBR, which then obviates the need for ESP & MSR, so everything can be allocated to data. GPT is irrelevant for small drives, and EFI is basically a headache. But if you're happy, then it's all good.
Edit for my above post: I meant diskpart, not fdisk.