At the very least I would change that into āI think we need to change the login form validationā.
While the āWe need toā sounds to me like an order which should be followed, when you add āI thinkā changes multiple thinks:
- It makes it clear that it is your personal thought. A wish from you.
- It changes from the style of order to the style of proposition. While you may still see some urgency, it communicates more that is a suggestion which can be discussed.
While there are still some āI verbā phrases I would avoid (share your observation and need and not your judgement of others, see for details here), I think that adding āIā improves communication by opening up space for discussion.