Its possible to have seerr search integrated into the main jellyfin search.

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Streaming torrents popcorn or stremio style is not very practical and never has been. Popcorntime still has working forks and stremio works with jellyfin to some degree but unless you also use a paid debrid service or maybe if you dont care about tanking your ratio on a private tracker There are jusy way better solutions: like using either an on demand iptv service inside jfin that costs about the same as debrid anyway but also gets you live tv.

Not to say there isnt tons of room for improvement still, but a lot of progress is being made. I suggest to folx if jellyfin doesnt meet your standards yet, try back in a year and see how much progress gets made.