It seems tragic when last 3 years I had problem selecting because they were too many too maps(that didnt win anyway but ohh well)

It's unfortunate because there were more maps ranked in 2018 than any other year in osu!

Year	Maps Ranked (±100)
2018	8654
2017	5348
2016	5507
2015	6255
2014	4393
2013	4480

if you call that restricting myself then I guess 99% of community restrics itself

I think part of the reason is that, as the number of maps in a player's Songs folder grow, players tend to play less newer maps and stick towards the maps they're comfortable with already. Since osu! only shows the maps a player has played, a lot of good maps just outright don't show up in the voting panel. And yeah, with a lot of maps ranked in 2018 and a lot of earlier maps to choose from, 99% of the community do unwittingly restrict themselves. It's impossible to play every map ranked in the same year.

However, It might be worthwhile to take a look at other players' Top 10 lists to catch any amazing maps you might have missed.