Some stray observations about the recent and future MCU films:
-Infinity War: Released April 2018; takes place ~ 2018
-Ant Man and Wasp: Released July 2018; takes place ~ 2018
-Captain Marvel: Released March 2019; takes place 1995
-Endgame: Released April 2019; takes place - May 2018 and 2023
-Spiderman--Far from Home: Released July 2019; takes place in 2023
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-Black Widow: to be released May 2020; prequel
-Eternals: to be released November 2020; prequel
-Shang-Chi: to be released February 2021
-Dr. Strange: to be released May 2021
-Thor: to be released November 2021
So...Engame and Spiderman were, collectively, a HUGE emotional climax for the 10-year-old MCU. Obviously. We don't get another Marvel film at all for 10 months. And the first two films once we start phase 4 are BOTH prequels. Pretty smart. This really gives people sort of an emotional "re-set" on the MCU. And we have a 5-year time gap to deal with. But here's the thing: by the time we get back to a story that is NOT a prequel and actually picks up where the MCU timeline left off, we will be some time in 2021 (depending on when Shang-Chi is set--it wouldn't surprise me if it is set sometime during the 5-yer gap, although I would not be surprised if the timing is intentionally or unintentionally somewhat vague). Again, smart. There will then likely be somewhat of a discrepancy between real time and when the stories are taking place. But by that time, the discrepancy will be a lot smaller, and the audience at large will not notice.
So I think that the present schedule of movies is actually pretty well-planned from the standpoint of dealing with two of the MCU's biggest challenges as things stand right now at the conclusion of phase 3: (1) MCU fatigue; and (2) the MCU timeline being out of sync with present time.
tl;dnr: Da Mouse ain't no dummy.