The thing is the game was made back then and not now, it was targeted towards kids that had plenty of time and needed to get much out of an otherwise short game.
Not saying unlimited continues is a bad thing, as long as it's done in a way that doesn't make the game way too casual.
I'm just saying that TMNT2 and TMNT3 for NES probably would've been WAY too easy if you were given unlimited continues and a kid back then could've plowed through it in 1-2 hours.
Compared to for example SF 2010 which was hard BUT had unlimited continues, so you still had to make your way through frustratingly hard levels, but had no real reason to stop.
That probably wouldn't have justified the pricetag in a kid's eyes and they might've even been let down.
You gotta' take into consideration what the target audience was and how often they really got games back then.
You got a new game maybe like once or twice a year, unless you were spoiled
