I'm gonna be honest, sometimes I feel insecure about using old voicebanks because everyone seems to be moving on to the fancy cutting-edge AI technology and I'm still using concatenative voicebanks from the V3-V4 era (with the exception of maybe Chis-A, who's free anyway). Yes, I can use SynthV Basic, but since that's NG for commercial use I feel like I can't use it to make original songs lest I eventually sell them.
Then again, my idealistic 12-year-old self specifically wanted to be a Vocaloid producer, and the things I experimented with before purchasing Miku, such as UTAU, Sharpkey/Deepvocal, and the free versions of SynthV (R1 evaluation and R2 Basic), and even RenoidPlayer and Sinsy before I even had access to anything more than a Chromebook (I had a PC I could use since before Web SynthV came out), were just to get me ready. Part of me just wants to honor my tween-age wishes, and I'm also super used to Piapro Studio by now.
But at the same time, in both the vocalsynth fandom and music-production communities, people are largely leaving the old stuff behind in favor of AI-powered stuff, especially SynthV at least in the West. Many of my favorite vocalists are getting updates- and for those who likely aren't, fans are screaming for them to, acting like their companies are criminals for not giving them such- and some new vocals are super tempting too, especially if I could potentially use them well in my favorite genres. But I can't afford it right now, and even when I'm set up with a job I can't just go spending all over the place no matter how much people say "you should totally get X Y and Z!"