Weird comparison, which makes me question whether you are familiar with the overall huge MegaTen franchise or not. Persona is way more accessible and mainstream-friendly than mainline SMT games these days. As others already mentioned, SMT V is already selling better than its' predecessors. Also, another fact that you can add here is that in just 1.5 month it sold around the same numbers as Persona 4 did lifetime on a PS2 which had bigger install base. Yeah, and don't forget about a lot of people in the community getting into mainline SMT games with this one for the first time. At least, I've heard a lot about it and I myself never played mainline SMT before V. Don't really wanna sound rude, but this post smells like plain port begging from someone who doesn't have a platform to play the game on.

remember the chills of losing the game in the first encounters on SMIV. 

I can't even find a physical copy in Spain. Sega didn't ship SMTV thinking It could sell this Well.

Yeah, It is out of stock

What a horrible take. Laughable lol. You have an ongoing Agenda against Switch 3rd party games.

SMT series is not the most accessible in gameplay. It's very niche to begin with. This is performing better than SMT3 on PS2 and SMTIV on 3DS. Persona is a different kind of game altogether. It's gameplay is very approachable. It's a spinoff. SMTV is the easiest SMT to get into and performing wonderfully in sales. SMT took a more open approach and more people bought it.

Shin Megami Tensei V has been out for almost 2 months and it's already the best selling game of the mainline SMT games. Heck, it's very close to selling a million copies. I'm sure it'll reach that much very soon.

Because people who enjoy Metroid, Zelda and Pokemon would definitely enjoy SMT, or because Nintendo fans have some sort of obligation to buy third party games whether they like the style of game or not?

That's what I was thinking, weird take. If you are interested in the game, then buy it (I have the game). But why any Nintendo fan should support this? Just because it's a big third party release? 

We've now seen two different flavors of "Third parties on Nintendo consoles are doomed" within this thread. First, there was the one that made it sound like SMT5 is a failure for not selling like Persona, even though the former is already the best selling game in the series after only a month and a half. Then there's the people who think Nintendo fans owe it to third party publishers to rush out and buy their games for having the graciousness and mercy to dare put games on a Nintendo console, even if they might not actually enjoy the games.

Amazing, congrats to Atlus, 1 million is certainly possible