Yeah that's the biggest failure in that regard currently. George Ford being picked to bench yesterday was borderline unacceptable to be honest. But the original question was essentially why is this even a conversation and it's because you have two contrasting talents doing everything they need to do at club level to take the reigns of the international team.
My opinion, not that it's worth anything more than passing a bit of time on here or at a lunch break or a pub, is that Fin is the guy I'd be investing the minutes into and I would have been doing so since the summer.
Like I've genuinely never seen such a well rounded, assured, controlled and skilled 10 playing at the level Fin was at 21 last year, everything was so clean. I'd watched him a lot last season, he looked like a modern ROG how he played in Thomond Park to win with 14 men and then when I watched him in the reverse fixture and the premiership, he always had time on the ball with plenty of options and picked the right one far more often than not. He can kick, he can pass, he takes it to the line, he's a linebreak threat and just always seems to be exactly where he should be. So I knew he was very good but then when he came to Leinster, he was probably the best player on the pitch in a losing team that were mostly on the back foot and clawed their way back in to nearly win. I felt like I saw something incredibly special.
I presume Wilkinson was like that at a young / younger age but equally it's an imperfect comparison because I think the starting point of what pro rugby has become today started when England really properly figured out what they were about in November 02 and dominated rugby for a year. (Different stratosphere to what the game is today but it was the first time rugby progressed beyond bash it up and throw it out even if it was only the first baby steps)
Ford and Farrell both had strong early starts to their careers but Ford could be shaky and could be gotten at by the opposition, it stuck with him to varying degrees in his career to date. Farrell was more assured but I don't think his distributing or playmaking was comparable to what Smith can do at the equivalent time of his career, Farrell got that up to an elite level but it was never quite natural like anyone in a GOAT conversation tends to be. Fin Smith looks kind of like the best of both to me, even physically he empties lads in defence, one of his issues is he's probably making too many tackles for a 10. Sexton was primarily playing amateur rugby at 21.
Admittedly, I haven't watched the prem yet this year, he might have fallen off a cliff or hit a rough patch but from the 6-7 games I saw last year (and I was aware of him before then so possibly going into the season before), I've just thought he's exceptional. We're all up on Prendergast in Leinster right now, he's a year younger and showing all he needs to and more in the Leinster / Irish system but I'd swap him for Fin in a heartbeat.
(Seeing later replies
@Not Mike Brown's Sock and
@BPM - think that covers it from the 2nd paragraph to here)
That said, given where England are and how the last few months have gone, Marcus warrants the 6 nations.
We're probably only 6-12 months away from having the same debate here, albeit Crowley is no Smith but still has the potential to be a highly effective international 10. It's a good "problem" to have, lower on the list for England than it will be for us I imagine, Ireland has always been a bit "good 10, good team" with David Humphreys being the unfortunate exception as the incumbent when we were too bad for that even to be true.