plenty of people who've watched those games while living through the 90s, including some people who're actually paid to analyse basketball as solo artists (so they aren't hacks like Stephen A Smith, they actually have to produce quality content to attract people) have raved about how underrated Miller was and how he deserved to be on All-NBA teams.
Got to be careful with revisionist thinking though.
The fans who watched in '97 didn't vote for Miller to be an All-Star
The coaches who coached in '97 didn't vote for Miller to be an All-Star.
The media who covered the game in '97 didn't vote for Miller to be All-NBA.
The coaches and media, who were paid to cover the game at the time, didn't think Miller was worthy. So what has changed since?
It's one thing if you think how we analyze the game has changed, and Miller had some underappreciated moneyball stat that is highly regarded today that was overlooked then, or if there was some media conspiracy against him (or for somebody else) that kept him out. But I'm not seeing those arguments being made.
Hm I think I've articulated exactly that in my posts, but sure I'll summarise what I think regarding this.
1. We absolutely have been making massive improvements in analysing players and it's been largely positive imo, player analysis has really gotten spot on for high level analysts.
2. Miller was underappreciated for his time because of the fixation on the raw slash line and FG%. His TS% (especially when relative to the era he played in) was absolutely bonkers and his creation was understated because people had no idea on how to value off ball creation (here's a great video on how off ball movement is really valuable in basketball:
https://youtu.be/QUZr26cpR8w).
3. His scoring was also underrated because of the incredibly slow pace of the 90s, adjusting his playoff scoring rates to the modern game would make peak Reggie Miller a 27-28 "PPG" scorer on insanely high efficiency as noted above. What's also overlooked is the on-court aspect of his scoring: besides being highly portable and economical, his scoring game was also incredibly hard to stop because of how difficult it is to guard a person without the ball, which led to his consistently amazing playoff numbers as well as fantastic team playoff offences.
So there you have it: Reggie Miller was the rare high volume + efficiency scorer who didn't need the ball in his hands to be effective (which led to him meshing with almost everyone) and has a very good track record of leading high-end offences when it mattered the most regardless of how good the opposing defences were, but only got three All-NBA nods because people simply didn't analyse players that way at the time.