I don't see a reason to stick so much to Tizen's past - does that really matter to market or average customer which OS/company had more glorious history? Mobile phones from Nokia had a great history, but where are they now? Huh?

But if you want to dwell into the past, then let's go.
I see Samsung's strategy as more far-sighted than Nokia had. I remember the the times when Samsung phones were not widely known and popular. At that time you could pick up a Samsung phone with Symbian, Windows Mobile (and later Windows Phone), Android and their own Bada OS. Samsung was trying many different options at the same time instead of betting almost everything on one platform like Nokia did (Symbian, then Windows Phone). That way, when it was clear that Android is taking the lead, Samsung could quickly go that way, scale up while droping those platforms that didn't have a future (Symbian, Windows Phone) and focusing on new promising ones to become a significant player on the mobile devices market in the end. Even though they became mostly Android, they haven't stopped working on the possible future alternatives. Tizen came as an evolution of SLP (Samsung Linux Platform) with some parts borrowed from Meego. Start wasn't impressive, it was in fact mostly disappointing, but they are improving.

It's easy to state, that Samsung could have put more effort on Tizen, as they are a big company and Tizen could do better, but Nokia was also (still is) a big company, so why they did not put more effort and resources on Maemo and Meego? Why Nokia had such a big delays in releasing the first Meego device (before Feb 2011). And in the end was it a real, pure Meego or more-like Maemo 6 with Meego compatibility?

Finally, so what that Samsung is a giant? Is it Samsung's fault that they grew so much as a result of running a successful business. People often repeat that Nokia started from rubber and paper. Do you know how Samsung started? Company was founded in 1938 and it wasn't easy to run a company in the first years under Japanese occupation, then during Korean civil war in 50s. Even having such hard start they've prevailed, developed and became a global player and leader in some areas. If you dig deeper the history of Samsung is no less interesting than history that Nokia had.

That's the past, but it's really not important to mass customer. Average customer doesn't really care if product he uses was made by a big corporation or a small startup. What matters is the product and what it offers to him/her as a customer.

It's a fact that Tizen become 4th smartphone platform, an important smartwatch and smart TV platform. Tens of milions devices sold in total with Tizen (compare that to tiny ~30000-50000 Jolla phone sales). People by shouting at TMO that "Tizen is a piece of crap without future" won't cover the above facts.

Instead of constantly looking at the past and thinking "what if", look at the future and help to shape it.