Blitz For Beginners?

Blitz play for beginners to casual players, is it good or not? I noticed a number of players rated around 1000 where majority of their games are from blitz games. I myself believed that in order to effectively achieve a solid foundation of chess principles and tactics, we have to learn from the games that matter, which are games that have been played with careful planning and analysis; which means, longer-timed games. At least playing this way until much learning is gradually achieved, because i believed blitz games are for those already with the sharpest mind and solid chess knowledge, otherwise when you do this while you still learning the basics, you end up not learning that much at all.

So maybe we can here from the Masters/Teachers here what they think about this and share to us all for guidance? Good day to all!

"... In order to maximize the benefits of [theory and practice], these two should be approached in a balanced manner. ... Play as many slow games (60 5 or preferably slower) as possible, ... The other side of improvement is theory. ... This can be reading books, taking lessons, watching videos, doing problems on software, etc. ..." - NM Dan Heisman (2002)
https://web.archive.org/web/20140627084053/http://www.chesscafe.com/text/heisman19.pdf

"..., you have to make a decision: have tons of fun playing blitz (without learning much), or be serious and play with longer time controls so you can actually think.
One isn't better than another. Having fun playing bullet is great stuff, while 3-0 and 5-0 are also ways to get your pulse pounding and blood pressure leaping off the charts. But will you become a good player? Most likely not.
Of course, you can do both (long and fast games), ..." - IM Jeremy Silman (June 9, 2016)
https://www.chess.com/article/view/longer-time-controls-are-more-instructive

yes that is entirely true, playing slower games, plus reading books, training videos etc.. that's how you learn most and improve. we got that. and we also fully understand that playing Blitz/Bullet is fun (at least for many, coz for me it'll OTB not "online" blitz where a lot of distractions can ruin the FUN isn't it?). Now that brings the question, Are those beginner levels who just play Blitz/Bullet in majority, happens to be just wanting to have fun, and not pursuing to learn more and get better? Or do they thought they are learning better that way?

Assuming no increment, most blitz games are won by running the opponent out of time. So the primary strategy in blitz is to make the opponent use more time per move (on average) than you do.

That's quite different from strategy in long time controls.