At the very least I would change that into “I think we need to change the login form validation”.
While the “We need to” sounds to me like an order which should be followed, when you add “I think” 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 “I verb” phrases I would avoid (share your observation and need and not your judgement of others, see for details here), I think that adding “I” improves communication by opening up space for discussion.