This is also an issue of poly count. The Sims 4 is designed to perform optimally on even the potato-est of potato computers. Leo Sims for example uses ridiculously high poly count cc (ripped from SL of course) and it can be unplayable for simmers without great rigs. There are some creators that make super hyper realistic models (almost like renders) and while they're pretty they also look out of place in the Sim world. To fix it, you then have to rebuild the entire environment to be more alpha-friendly which means more high poly mods/cc and thus more gameplay lag. I think if there is a Sims 5 and EA allows a marketplace like SL does then it will worsen the paid cc problem but will also guarantee higher quality models. Unfortunately, the people with terrible computers stand in the way as Maxis is committing to keeping their business.
I tried some of Leosims clothing in the past, I couldn't believe how badly it was made, it didn't even fit my sim properly. The clothing was floating around my sim, no precision at all, such a piss poor job. I had no idea he was stealing meshes from Second Life... but that does explain it a lot. The guy is a poser, a fraud and a cheat by the looks of it without the talent to make his own clothing.
He must also be garbage at using blender. I'm very much a novice but even I can resize a mesh and make it look half decent in blender. I'm not qualified to create quality CC that I'd feel good enough to sell and then cry in forums when people download it. I mainly just repair clipping on my favourite clothing items cause all my sims are thick asf so its sometimes required.
I see Leosims content and just walk the other way, his clothing is so bad I'm not sure why people use it. Extremely high polycount on clothing meshes are usually a sign the person is a noob, lazy or a mesh thief. There's tons of tutorials that show you how to use the decimate feature in blender to make meshes less poly but still look good. There's even tutorials for marvelous designer on how you should export your meshes so they still look good but have lower poly count.
A modder named Mauve Morn has really nice detailed videos and written documents on how to make meshes from MD to Blender low poly but still look good, maybe Leosims should spend less time stealing meshes and finally learn how to make his own and make them optimized. Low 5-10k poly dress with a proper bump map is just as good as one with 100+k poly dress and no bumpmap.
