I know that there are a lot of expressions that have similar meaning in Japanese. In JLPT N3 grammar, there's だけでなく that means 'not only...but also...'. And lately, I found the expression にとどまらず in JLPT N1 grammar list that has the exact meaning as だけでなく. The only difference that I know is that だけでなく can be attached to Noun, Verb, and Adjective. Meanwhile にとどまらず can only be attached to Noun and Verb. But, I want to know if there are other differences regarding their meaning and usage. Thank you
They have different meanings. Because they mean different things, you can't freely replace one by the other.
- 「とどまらず」is a negation of 「とどまる」, and 「のみならず」 is a negation of 「のみなり」. Here, the 「とどまる」 is a verb, the 「のみ」 is an adverbial particle, and the 「なり」 is an auxiliary verb of determination.
Having said that, the meanings the two words have are:
(1) 「とどまらない」＝"it does not end there"
Meaning that there is a suggestion of on-going continuousness.
(2) 「のみならず」＝"not limited to"
Meaning something is not limited to something, suggesting the infinite possibility.
Because the two are common in terms of not having temporal discontinuation in "continuousness" and "infinite possibility", they tend to be similar.
However, the difference between the two is that while the word 「とどまらない」 suggests "ongoing", the word 「のみならず」 suggests a state. The former is used in dynamic situations, and the latter is used in undynamic situations.
Since 「才能がある("having a talent") indicates a state, 「とどまらず」 which expresses "ongoing-ness" is unsuitable.
If you interpret this as something "dynamic" as is "the scope of action is expanded to ...", you can use the word 「とどまらず」, and if you interpret this as a "state" as in "the scope of action throughout ...", you can also use the word 「のみならず」.
The first one has two verbs 「（成功に）とどまらず」 and 「（社会貢献に）尽力した」, but the second one has only one verb 「（社会貢献に）尽力した」, so the word 「成功」 has no choice but to also depend on the verb 「尽力した」.
The sentence ends up meaning "became committed to both success and social contribution," and it does not render the nuance of "couldn't be content with the success and made a contribution to the society." This is because of the 「のみ」 being an adverbial particle on which a noun depends.