Well, all "Trinity" means is three parts of one whole, basically, etc.
But in Christian theological terms, it means, either, the three parts of God that are one whole, or three God's that are one whole, making up one complete God, etc.
My problem is with how it has been classically taught, or with the way people have tried to explain it over the years. They present it as some kind of "oh so mysterious divine mystical mystery that cannot be possibly understood", etc, and their way of explaining it has always been that they are the exact same, have always been equal in every single way, and are interchangeable, and I disagree with that now, because of new information/revelation, etc.
Full omniscience always and from the beginning is the first point/issue, etc. And the biggest evidence of God not always being fully omniscient, is with God in the OT, or God from the beginning starting with Adam and Eve on onward throughout the OT, etc. Not only does He not act or behave like a God who always knew/knows everything, but there are also some things also (certain decisions, actions, inactions/choices, etc) that He just couldn't see past, or didn't fully know fully, etc, which is inconsistent with a God who knows everything, etc. He (God in the OT) knew, or could know, or could see a lot, but just not all, etc, and I also think that Jesus at some point realized this also, or maybe even perhaps always knew this maybe also, etc.
Either way, Jesus knew or found out about this somehow, and created almost a whole new religion or theology around it, etc. Reasoning, or maybe perhaps knowing, that there was also a God (besides God in the OT) who did always fully know all, etc. How He knew this or came to know this I guess no one can know for 100% absolutely sure, etc, for there are many theories, etc, but either way, he knew this, or came to know this, etc, and it changed everything for him (as it would also change everything for us, etc) because he knew this, etc. So much so that he built almost a whole entirely new religion or theology around it, etc. Consisting now of God the Heavenly Father, (who was the Highest/Higher of all at the beginning), and God in the OT, (who would now be called God the Holy Spirit) (who was slightly less than that One from the beginning), and also himself, who would be/now is the God who was man, or was the God-man, or was God in fleshly form, not being either God the Father, or God the (Holy) Spirit, but still God just the same, claiming to be equal to, or having just as much equal abilities (ability to do miracles, just as much, if not more, knowledge and wisdom, etc) as God the God in the OT had, whom Jesus would now re-call or re-name or re-label, God the (Holy) Spirit now, etc.
This God the Heavenly Father that Jesus claimed to have new information about, knows all, and is the only One who always knew absolutely everything from the very beginning, etc. (but the others might come to it later, etc) (but that's another story/discussion for another time, etc) but anyway, this God the Heavenly Father who was the only One who started out knowing everything, etc, is so different than any of us others, including the other Two, that He could not just show Himself to us without the other Two doing so for Him, etc, because He would have to become more limited than He both always is/has been quote/unquote "now", etc. Think of the other Two as being God in time with us, whereas this other One, or this other Higher God, could not ever be in time with us, etc, which makes Him very, very different than all of the rest of us, etc.
I guess you could say that knowing all and being outside of time always limits, or will limit Him in that way always, etc.
Limits Him in being able to express Himself in certain way that are required for us to be able to know Him, and that is why He has the other Two, etc. So that there is a beginning to God, and let's say a middle (to God), and then also let's maybe say a much more fully mature version, or an ending (to God), etc, whereas these things were just not ever possible for the One who always, always, knew or knows all, etc.
God Bless.