Like I said, my father was a medical doctor for 50 years. He firmly believed in the power of suggestion and the power of positive thinking. Some people call it the placebo effect. This is a part of just about every study that has ever been done. They have to have a control group to see if they can improve upon the results you get from a placebo.
The job of a coach is to motivate the players so you can get a better performance and hopefully win the game.
When Penicillin and antibiotics came out it was considered a miracle drug. They can get up to 95% rate of recover compared to 50% with a placebo.
God delivering on His promises has nothing to do with you, your mindset, your attitude, or suggestion.
It has everything to do with Him and His character.
That's why it's so important that He doesn't reneg on any of it, because it would reflect negatively on His character, it woul diminish His glory, make Him less worthy of praise, and frankly, earn distrust and suspicion of His intents and plans.
a back biting god would not be a god you would want to spend 24/7 worshiping anyway, even if he still maintained the power to send you to hell, that would just be you cowering in fear and "worshiping" out of fear that he would harm you.
When people try to convince me of their view of heaven, which doesn't line up with God's promises... that is the effect it can have on me, it plants doubt in my mind about God's character and nature and paints Him as someone who would "change their mind" and "alter the deal, pray I do not alter it any further", It inspires fear of God, without love and trust of God.
These are well meaning brothers and sisters, however when what they say involves God renegging on promises to do "something different" even if you claim it's "better" than what is actually promised in the bible, it throws shade on who God is, and makes the prospect of worshiping Him seem like a terrible thing done out of fear, because all I can come up with when the view of God is.. an all powerful being that changes His mind on a whim, and the only reflection I have to rate a creator's work, is this current, cursed creation, is "it could be worse, at least it's not hell"
For some people, this life and this world are full of blessings.
For others it's full of affliction.
For the first the perspective is your life is a mountain of blessings, and Jesus is at the top of it, you almost fell off the mountain and Jesus caught you and pulled you back up on the summit. For souch a person, it's easy to be thankful to the source of all those blessings.
For the second, life is a hole in the ground, and the hole descends all the way into hell and you just cling onto the edge to prevent falling, but everything around you is miserable with nothing good in sight, just danger and suffering. Jesus pulls you out of the hole, and you're thankful for that, but now what you see is the hole behind you and... flat empty ground to all sides. For that person, if all Jesus does is pull them out of the hole. It becomes easy to say "thanks but if I was never born I'd never be in that hole in the first place"
So God's promises, that the next Earth will not be a vast barren wasteland even to the person in the hole, is pretty important, because this current life and creation doesn't really generate thanksgiving, it can generate a desire to have never even been born.
Think of Job, that was literally his wish in his affliction in Job 3. He was suffering, and wished he'd never been born.