Hey so if this is a loaded question you don't have to answer but how would you describe a good turtle enclosure
Not a loaded question at all. The answer depends on what kind of turtle though. I’m going to assume you are talking about an aquatic turtle rather than a box turtle and since the most commonly kept aquatic turtles are usually sliders, painteds, and other similar basking turtles I’ll do a brief overview of a good enclosure for one.
The bare minimum:
~10 gallons of swimming space per 1 inch of shell (4 inch turtle needs 40 gallons of swimming space)
UVB lamp (changed out every 6 months)
filter rated for ~2x the volume of the tank
basking platform where the turtle can entirely dry out its entire top and bottom shell
water heater (for most species)
The larger the enclosure the better; turtles are very active herps and will use all the space you give them. My 4 inch adult southern painted is in an almost full 65 gallon tank and I still wish I could give him more space to swim. Adding natural tank furniture like plants or driftwood is nice enrichment too, but the #1 thing you can do to improve a turtle enclosure (assuming the bare minimum requirements are met) is to add more space.
My personal preference is to have sand as a substrate (allows natural digging behavior and my turtles like to kick it onto their shells and rub on driftwood to itch better) and to use tannin-heavy water as it seems to help with shell health.
Hope that helped! Feel free to send me a message or another ask if you have more specific questions!