It is a mixed bag for me. I don't like TDKR or Tenet much, but Interstellar and Dunkirk are definitely top 5 Nolan for me (1. TDK, 2. Dunkirk, 3. Memento, 4. The Prestige, 5. Interstellar).
But even though I like Interstellar a lot, it does have some significant flaws that kind of go hand in hand with problems I have with TDKR and Tenet when it comes to convoluted plot eventually trumping character development, awkward editing and exposition in over-reaching back halves, etc. I thought Nolan had learned some lessons when I saw Dunkirk, with its minimal exposition and simpler story made alive through the daring and virtuosic technical approach, but then it is like he tried to apply only half of those lessons in Tenet. He heaped back in more exposition (but only for plot, little for character--which I would have preferred if I had to pick) and plot contortions than ever, which made for a bit of an unholy storytelling mess, imo.
I agree with you, I do think a lot of it has to do with this pressure Nolan seems to put on himself (ever since Inception) to make these elaborate genre blockbusters that are juggling a lot of different objectives. At this point I would love to see Nolan do a somewhat simpler story again that has a little more room to breathe on character and basic storytelling, while still applying his ambition and the technical excellence of his collaborators to how he tells that story.
That doesn't necessarily mean a smaller budget, but a smaller budget could help kind of set those parameters for him and reign him in a little. In movies like Memento and The Prestige there's a laser-like focus on communicating an interesting but resonant story--and that kind of focus simply isn't present in his later films, even the ones I love.