A 3x8 is still my preferred drivetrain for long distance touring. Chains are DEBATABLELY cheaper, easier to maintain, last longer and stronger. Cassettes are smaller diameter hence potentially lighter and unquestionably less expensive.

Recumbents are similar. The long driveline makes chains 3x as expensive, but also makes them immune to cross chaining. Bents are mostly spinning on pavement, so subtle gear steps are nice to have.

1x is great for off road bikes where quick gear changes are necessary.

Mid drive ebikes are pushing things back to 8 speeds or less and 1x front rings.

More rear cogs aren't necessarily the wave of the future.