I am in no way the target audiance of the 'basic fighter' I dislike (to the point of it annoying me when OTHER people take that subclass at my table) however there are fans of it, and there is a reason to keep something basic... or as you say 'tutorial' in the game
I find the entire concept of the "basic Fighter", especially the laughable idea that they're for "new players", foolish at best, and actively disingenuous is more like it.
I've started quite a few new players in 4E and 5E, and how many them wanted to be a Fighter at all, let alone a "basic Fighter"? Let me tell you.
Exactly ZERO.
Not one. No-one has even been remotely interested in a playing a Fighter as their first character. The least-nerdy most basic/mainstream person I've played D&D with, who is definitely a non-nerd, and only played D&D a few times (though he swears he enjoyed it), picked a goddamn Swordmage in 4E. He didn't pick a Fighter. Yeah he was a towering Dragonborn (IIRC), but his attitude was that Fighters sounded "boring". And that was in the edition when they were arguably least boring!
Other people aged between and 10 and 45, what have they picked? Mostly the same three classes:
Ranger - a large part of this is because it sounds exactly like what people want, it's just the mechanics suck - also people love the idea of the pet.
Warlock - This seems to have more "basic appeal" than other caster classes, and given its more straightforward to play as well, that's probably a good thing.
Druid - I don't really understand this but new people seem to instantly gravitate to it, albeit not as much as Ranger and Warlock. One of my friends was forced by his daughter to buy whatever sourcebook it was which had the Circle of Spores Druid in, because she'd read about it online and would not play anything else in the game he was intending to run (she's been keenly observing our D&D games since a young age when allowed!).
Paladin, Cleric, Rogue are probably the next three. As noted no new-to-D&D or new-to-RPGs player has wanted to play a Fighter, and I think only one wanted to play a Wizard and cited Harry Potter in making that choice.
This is all experience not fact but I am just incredibly skeptical about the whole "simple Fighter" option.