Depends entirely on the reticle. The target rifle reticles are the ones that are too thin generally speaking.
A decent quality tactical reticle like the Bushnell G2DMR or similar is good for all magnifications. On a 6-24x scope, I use it at ~10-16x for deer, or at 24x for long range varminting, and the reticle thickness is simply not an issue. This is on a longer range, 300m-700m type rifle.
The issues arise in low light, which is where the illuminated reticles come into play. A low power illumination is amazing on an animal at the last of the light. I have one scope relatively new to me with a Tritium illuminated dot and a 56mm objective - holy shit I can see animals perfectly clearly on 6x or 10x mag at 150m that I can't even see with the naked eye.
There are as many answers to this as opinions, very much a personal preference. I like tactical reticles for shooting multiple animals quickly, so I holdover on the reticle instead of trying to adjust the dials. I've yet to use a tactical reticle that was either too thick, or too thin.
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