Disagree about first paragraph, rest too long.
Many times open/close are, equally - if not more so - as important as high/low values which candles accentuate.
It is important to you because you chose to analyze the market through an arbitrary timeframe, say for example H1 candle that you perceive as important to you.
However other market participants make decisions based on all other kinds of different timeframes, or tick charts, volume charts, or indicator values (also based on all kinds of different timeframes), and some investors including large institutions simply buy/sell stocks based on valuations or portfolio re-balancing and not based on where certain candle opens or closes on certain timeframe. Therefore, your “disagreement” actually confirmed exactly what I posted earlier.
BTW, it’s a good thing that traders disagree on things because if all traders would agree on everything, then the markets would not move much.

you mean fixed as in more important than H's & L's,