1. It is noteworthy that Paul said that both tongues and prophesy would cease. So why focus on that which was to cease? There are a total of 23 gifts of the Spirit.
2. It is also noteworthy that out of all the epistles, there is only one which addresses PROBLEMS with the gift of tongues within the local church. If this was a critical doctrine, we would find it in almost every epistle, would we not?
In answer to your questions:
1a.
All the gifts will cease... once we've grown up fully into the perfect man.
Have you not considered this? What need will there be for preaching or teaching when we all "know as I am known" (which means perfectly). What need will there be for healings when we are all perfectly healthy? What need will there be for prophesying once all are perfectly edified, exhorted and comforted in the presence of the Lord?
1b. Are PROBLEMS with tongues all that you are able to see in 1 Corinthians 14?? If you believe you are reading with open and unbiased eyes, try seeing (and listing) the
benefits of speaking/praying in tongues. For example, are you able to admit that it is a BENEFIT,
not a problem, to be able to "edify" yourself? ( 1 Cor. 14:4.)
2. That is an assumption on your part. We might assume that if Jesus wanted people to know that he was the Christ, he would tell them when they asked him...but that's not how he did it (Luke 22:67,68) Just because God doesn't do things in the way that makes sense to man, that doesn't make God's way wrong. Besides this, How many other teachings & epistles(letters) simply aren't included in "the bible"? For example, where is the epistle to the Laodiceans? Was "the bible" wrong when giving the commandment to read the epistle from Laodicea?
God gives us enough to get started..but not so much as would allow us to avoid seeking God. If we really want to know perfectly, we seek God until we find him. And those who don't need/want God can simply hold up the pieces (that he's made available to all) and claim that they have full knowledge.