F-35 problems still exist.

[Bob Riebe]

This is nothing new as from the get-go some military experts have not been afraid to say the F-35 has as many problems as advantages.
These problems are one reason some export countries are having serious second thoughts.
Way back when the first test flights were going, the Air Force said if less than BVR engagement, the F-35 is at a disadvantage.

https://www.defensenews.com/air/2020/04/24/the-pentagon-will-have-to-live-with-limits-on-f-35s-supersonic-flights/

https://www.defensenews.com/smr/hidden-troubles-f35/2020/04/24/the-pentagon-has-cut-the-number-of-serious-f-35-technical-flaws-in-half/

https://www.defensenews.com/smr/hidden-troubles-f35/2021/07/16/the-number-of-major-f-35-flaws-is-shrinking-but-the-pentagon-is-keeping-details-of-the-problems-under-wraps/

[ironglow]

.. But don't all new weapons systems have a lengthy period of "working out the bugs"...some of which don't even make themselves known before years
  of usage?

  ..But now we are venturing into the F47 fighter.  It seems "development" continues, as the planes begin to prove themselves in real combat.

  Seems like we always  had those "teething problems", even back in WW2. Like the old P38s, P47s, B17s and B29..as the war years went by we had
   improvement markers, something like the P47 B, P47 F, P47 G...etc.

[Bob Riebe]

.. But don't all new weapons systems have a lengthy period of "working out the bugs"...some of which don't even make themselves known before years
  of usage?

  ..But now we are venturing into the F47 fighter.  It seems "development" continues, as the planes begin to prove themselves in real combat.

  Seems like we always  had those "teething problems", even back in WW2. Like the old P38s, P47s, B17s and B29..as the war years went by we had
   improvement markers, something like the P47 B, P47 F, P47 G...etc.

Not like this one, as when it was still in prototype stage some military people were not happy and that is a long time ago.
The only aircraft that had as many problems was the f-104 and those cause a lot of dead pilots.

[ironglow]

  Was theF 104 the one that was not very stable on takeoff or landing ?

[Bob Riebe]

  Was theF 104 the one that was not very stable on takeoff or landing ?

     "The Lockheed F-104 Starfighter, known as the "Widowmaker," had a high accident rate due to its unforgiving handling characteristics, high speeds and landing speeds, and a downward-firing ejection seat that often proved fatal at low altitudes"

[ironglow]

  Was theF 104 the one that was not very stable on takeoff or landing ?

     "The Lockheed F-104 Starfighter, known as the "Widowmaker," had a high accident rate due to its unforgiving handling characteristics, high speeds and landing speeds, and a downward-firing ejection seat that often proved fatal at low altitudes"

   Ye Gads ! One would think that a downward firing ejection seat would have been ruled out as unworkable.  At anything less than 2000 feet,
   one would want to power the ejection seat so as to gain even more altitude, to allow full opening of the 'chute.

[Bob Riebe]

  Was theF 104 the one that was not very stable on takeoff or landing ?

     "The Lockheed F-104 Starfighter, known as the "Widowmaker," had a high accident rate due to its unforgiving handling characteristics, high speeds and landing speeds, and a downward-firing ejection seat that often proved fatal at low altitudes"

   Ye Gads ! One would think that a downward firing ejection seat would have been ruled out as unworkable.  At anything less than 2000 feet,
   one would want to power the ejection seat so as to gain even more altitude, to allow full opening of the 'chute.

At the time ejection seats were still a new thing, and they thought in an ejection the seat may not clear the tail.
The F-106 had another widow maker seat; it was designed for super sonic ejection and killed more pilots due to system failure than it saved.
They finally replaced it with a British Martin Baker seat; Martin Baker had/has a reputation for the most reliable and succesful seat maker.