Severe disabilities, like e.g ADHD or autism, will definitely make it harder to successfully partner with someone. But they do not make it impossible to partner

Severe disabilities, like e.g ADHD or autism, will definitely make it harder to successfully partner with someone. But they do not make it impossible to partner well and as you pointed out there are people with disabilities that has partnered well. However, for a person without such problems it is probably better to avoid this extra complexity unless there is a huge upside to the partnership that compensates for the downside.