That's actually a very good definition of schizophrenia, I don't understand your point. Mania does not necessarily mean connections and meaning, it's more related to mood and impulsivity.
This is why depression, a lack of meaning, is described as the other side of the coin of mania: because mania is an overload of meaning.
This is also not a good definition of schizophrenia at all. Schizophrenics are people who, in extreme cases, can experience full-blown hallucinations. Meaning and connections don’t create literal hallucinations.
the only difference is, one can recover from manic psychosis
But, the core features for schizophrenia seem to be disturbed perception (hallucination), beliefs (delusion), and thought processes (abnormal reasoning, speech, and behavior). These can range from subtle or extreme over the life of the patient. The experience of these may lead to agitation, but mania often presents the other way around. The increasing energy seems to precede the other psychotic symptoms.
There are two other common conditions which also have many of the same symptoms, but not in the same pattern. Delirium is often a temporary condition when someone is sick or injured. Dementia is a terminal, degenerative condition. Sometimes a patient can have all of these: a lifetime of schizophrenia shifting into dementia in old age, punctuated with bouts of delirium due to infections etc. The differences may be recognizable and help with treatment plans, but the symptoms can all blur together. One way doctors try to distinguish them is by noting the timing of symptoms.