Welcome.
... but you're very confusede about video capture.
Retrotinks are for video game consoles, not videotapes, and all the "triple/whatever buffering" is very technobabbly. Game consoles have a very precise generated output that can be timed against, while videotapes have none of that, and really do not properly time video. At most, it may act like a non-TBC frame sync, but even that is not clear.
Retrotinks are not TBCs, and do not replace TBCs. Not quality line TBCs (that clean the image) in certain S-VHS VCRs, nor external frame TBCs that clean the signal.
Elgato is so infamous that it earned the nickname "Elcrapo" for video capture cards. (Elgato makes several other gear items but capture cards are NOT one of them.)
You need to be careful with random "success" stories, the people that claim "it worked for me". Those people are happy with audio quality through a telephone, and think that "potato quality" video is great (with the dunce excuse "it's only VHS"). Remember, some people eat a diet of pure McDonald's and Taco Bell, and I doubt you'd want to follow their diet because "it worked for me". (Round is a shape, right? Your heart is supposed to beat fast, right?)
Do not upscale videotapes for capture. You lose massive amounts of data doing this. Videotapes should be native capture as 480i NTSC (576i PAL), 29.97fps/29.97i NTSC (25fps/25i PAL) interlaced, YUV, Rec.601, etc. Not to video game specs, not to HDTV specs, etc.
DV cameras are 1990s technology, and use heavy compression that throws away 50%+ of the color data. You end up with cooked colors (bad tint/hue), blotchy spots, gray muddy areas, and DV macroblocks.
Windws XP/7 is best for consumer analog videotape capture, as that was the OS of the era. Tape capturing is now a legacy task, and all the "new" stuff is for HD/gamesetc, and does poorly with SD videotape sources. The hardware, software, and OS of the mid/late 00s into 10s is what you need and want. All the "new" stiff requires workarounds, treat the capture card like a webcam, etc.
You need specific cards.
Quote:
would not be willing to invest into a $600-700 VCR with built-in TBC due to VCR reliability concerns
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This doesn't make sense. Low-end VCRs are a concern (even when "working"), while mid/high-end quality VCRs merely need to come from a reputable reliable source (not random eBay sellers that lie about "tested" and "working").
For quality capture, the quality starts at the VCR, is maintained/purified by the TBCs, and the capture card then baken in whatever it sees from the VCR/TBC. After digitize, there's really no more room for corrections, no magic software to CSI "enhance".