If you post on a public forum, expect to get public replies! It is intended for everyone to use, read and reply as they wish.
I think you are wrong. Plus your not even reading my reply. You say you will pay a premium for an SE sized device when I just said there will be one! The 5.4" is literally a couple of mm larger all round than what the SE is. They cannot get todays tech into anything smaller.
People have different sized hands, so saying even a SE is too large and "dangerous" to use is ridiculous. I can genuinely use a 6/7/8 one handed without a single issue. As can many others. You say you have "long fingers" compared to most, yet find even the SE too large? Doesn't add up I'm afraid.
Also as a side note, you say the new generation of phones are slippery - that's not actually the case. The glass backs actually give the phone grip against the skin compared to simply cold metal.
A large phone is uncomfortable to carry, I agree. But the 6/7/8 in my pocket feels hardly any different to my SE does because it is also thinner, and it has curved edges which aren't sharp when the device is used for any period of extended time.
If you think that Apple didn't do any market research your delusional. You think they just produce something, throw it onto the market and hope for the best? Seriously, they wouldn't be the success they are if that was their practise. If it were, you'd have new "innovations" every year that were simply gimmicks that they hoped would sell. That never has been Apple's business strategy.
I never said that Apple think EVERYONE wants larger phones, in fact they've done this to offer the smallest from anything else they offered, 8 aside which they could have just pulled from the line up anyway with no other option forcing many to buy the XR or 11 as the next cheapest option, or the 5.8" Pro model as the smallest offering. How much do you think producing a new small phone would cost? Including new tooling, testing, sourcing new materials and time on designs etc? More than you probably even realise. Where as the new SE enabled them to make it for next to nothing in comparison, and pass that saving onto the customer.
As an example, if Apple could (they can't) fit the later camera tech, improved modem, updated the processor and GPU and other bits - yet it came out in the same old SE form factor, how many do you think would buy it? Would it attract buyers over from Android devices or make people consider replacing their older 6,6s,7,8 devices? No it wouldn't. It would cater for the small amount who love the SE, and they are right to love it, it's a great device as I've already said. But your looking at it from your own personal wants, not the masses.
Think about it this way... if Apple make such as successful phone that offers great specs for a small amount compared to the flagships, it's only going to mean that they won't be able to increase the prices so easily on the next line of phones as the gap won't be big enough to warrant the price difference for many. This will also mean that Apple are catering for more people's wants, including original SE owners by offering the 5.4" phone later this year! It will have all the latest tech, and probably be around $650-$700 but with a squared design very similar to the original SE. Surely that is good enough for the people who want small? I don't see any one else offering anything similar in the market that anyone would genuinely buy and trust to last long term.