Stewart is talking about character growth. In both the real world and the Star Trek universe, decades have passed. Jean-Luc Picard is not the same person he was 20 years ago, just as Patrick Stewart isn't the same person he was 20 years ago. Neither am I, for that matter. I'm not the same kid tuning in every week jealous that Wil Wheaton gets to be on the Enterprise and I don't . . . .
Stewart was not interested in ST: The Next Generation "Season 8", or in yet another entry in the movie series after ST: Nemesis, where (in episodic storytelling fashion) Picard is in pretty much the same place he was in most episodes of the show. Stewart has expressed similar sentiments in reprising the role of Professor X in the X-Men franchise. Both the Professor X of "Logan" and the Picard of "Star Trek: Picard" are men who have grown and are in very different places in their lives from what we remember "back in the day".
AND I LOVE THIS! I'd watch a "Season 8" of Next Gen, don't get me wrong, but this is storytelling that has me excited and intrigued. Way more interesting to see how the decades have treated Picard than watching a re-tread of Next Gen. ST: Picard builds on top of the lore of Next Gen and the rest of Star Trek, but it is most certainly a show with a different storytelling tone for an audience that has also changed over the years, long-time Trek fans and just sci-fi fans in general.
Are there some long-time fans grumpy that ST: Disco and ST: Picard are "not true Star Trek" shows, just like we had grognards here on ENWorld grumping that the latest D&D edition is "not my D&D"?!?! Of course we do. That is a constant of life. But is there a LOT of fans unhappy with the direction of the new Star Trek shows? Possibly, I suppose, but I haven't seen evidence of it, and both shows seem to be doing just fine.
EDIT: Add in last paragraph.
On the upper part of your last paragraph...I remembered the days of thread closings and bans (shakes head in sorrow on those old days)
For ST, the brand is more recognized than D&D, and yes the feverish love for it, has a greater pronounce effect than the former. But given the latest 'assault'' on DW and SW, long time fans and those who were raised on these fictional, creative fantastical stories, followed by least 3 or 2 generations. There is a heavy investment, D&D in the same vein. But the others have greater representation, that is a undisputed fact.
As a friend of min once said to me maybe a decade or two ago, that yes, rebooting or refreshing a franchise for a newer audience, is a given, if the companies to keep that said IP and wants to be make a continuing profit from it. At the time, I didn't think of far reaching consequences of such a decision. In today's climate, I do now...there is much more diverse media to distract or attract that needed audience to give the coin to keep that specific franchise alive.
This show face these challenges to be relevant and to be current in the people eyes...how that is done, is the journey that will be questioned.
It is same way, we gamers have questioned the use of new Editions of D&D, is it worth getting, it is worth playing, it is worth spending that coin. I will put in the record, I am SCIFI nerd before D&D, was expose to the former from the late 60's, 70's and early 80's, 1983 or '84 I started into the RPG life.
I do love both genres, but Sci-Fi gets the upper hand with me.
There is a divide with Trek, as there with Star Wars, and Doctor Who, on the last two, are they salvageable? Trek dealt in possibilities and hope for a greater future. Star Wars dealt with dealing with the Darker nature and holding it at bay.
And being honest here...what did Doctor Who represent? Watch enough of it, but I didn't get or see the message.
The other 2 mentioned, I did...hence the different points of views.
Thanks for the discussion, the EnWorld crowd has never disappoints.