[TYPO3-english] Why to use Typo3 user management system and not your own?

[Alina Fleser]

Hello to everybody,

My question is why to use Typo3 user
management system (frontend users) and not to create your own
management system (with your own tables) when developing a website
using Typo3?

I hope for your support, as my situation is quite
difficult! My company and an other company, both are working for the
same client by developing 2 different websites (publishing websites
with community functionality, for both the client requested explicitely
to use Typo3). The original agreement with the client is that we will
use for the community part the extension / extensions developed by the
second company (custom extension / extensions)  and we will adapt the
templates to our project layout. When receiving one of the extensions,
we were surprised to find implemented a new user management system: new
tables for fe_users with custom login, forgot password, account
creation, profile, etc. 

I argumented that this is bad choice, using the flowing arguments:
- the Typo3 permission checking on pages and content can't be used;
-
the Typo3 core will not interact with this custom user management
system; the Typo3 core will not be aware of an authentified user of
this kind;
- no public extension will interact with this custom
management system; no public extension will be aware of an authentified
user of this kind;
- the Typo3 caching system is affected; As they
are a small number of user groups on the site, the typo3 caching for
user groups could be a solution for a good page time rendering; By
using a custom user management system, the Typo3 caching system will
not interact ore be aware of an authentified user.
 
I also
received an answer to my arguments: from the begining of the project
their team planned to not use Typo3 users system to avoid possible
problems caused by third parties extensions; they consider that having
their own custom user system offers better control.

As
you imagine, I don't want this kind of extension on "our" site (as,
also, no Typo3 coding guideline was respected  or at least taken into
account). Unfortunately I'm blocked by their answer. 

I hope for you to help me with some undoubtedly arguments and some good ideas. 

Thanks in advance,
Alina Fleser