Hello,

There is a clear statement in the Pali canon that bringing samadhi to
complete development is necessary:

“So vata, bhikkhave, bhikkhu agaaravo appatisso asabhaagavuttiko
‘sabrahmacaariisu aabhisamaacaarika.m dhamma.m paripuuressatii’ti neta.m
.thaana.m vijjati. ‘aabhisamaacaarika.m dhamma.m aparipuuretvaa sekha.m
dhamma.m paripuuressatii’ti neta.m .thaana.m vijjati. ‘sekha.m dhamma.m
aparipuuretvaa siilakkhandha.m paripuuressatii’ti neta.m .thaana.m
vijjati. ‘siilakkhandha.m aparipuuretvaa samaadhikkhandha.m
paripuuressatii’ti neta.m .thaana.m vijjati. ‘samaadhikkhandha.m
aparipuuretvaa pa~n~naakkhandha.m paripuuressatii’ti neta.m .thaana.m
vijjati. (АN 3.15)

2. Dutiya-agaaravasutta.m- Second on unruliness.

003.02. Bhikkhus, that bhikkhu who is unruly, rebellious and not of the
sharing nature with co-associates in the holy life should complete the
lesser ethics is not a possibility. Without becoming complete in the
lesser ethics, that he should complete the training is not a
possibility. Without completing the training, that he should complete
the mass of virtues is not a possibility. Without completing the mass of
virtues, that he should be complete in concentration is not a
possibility. Without becoming complete in the mass of concentration,
that he should be complete in wisdom is not a possibility

Bhikkhus, that bhikkhu ruly, docile and of the sharing nature with
co-associates in the holy life should complete the lesser ethics is a
possibility. Becoming complete in the lesser ethics, that he should
complete the training is a possibility. Completing the training, that he
should be complete in the mass of virtues is a possibility. Become
complete in the mass of virtues, that he should be complete in the mass
of concentration is a possibility. Become complete in the mass of
concentration, that he should be complete in the mass of wisdom is a
possibility.

4. Dussiilasutta.m - Unvirtues.

Without right concentration and right concentration trimmed, the cause
for knowledge and vision to see things as they really are, is destroyed.

http://metta.lk/tipitaka/2Sutta-Pitaka/4Anguttara-Nikaya/Anguttara3/5-pancakanipata/003-pancangikavaggo-e.htm

Best regards, Dmytro