ah, I see, you think I have some hidden Russell agenda?
I don't have any particular feelings towards Russell. It's more that I think Bottas isn't setting the world alight and I don't think he's a good long-term prospect for Mercedes. If anything I'd prefer to see Vettel there but I don't think that's realistic. I'm looking at the Merc junior program and Russell stands out for me. Think suggesting someone like Perez would be highly unlikely, so the reality is that the toss will probably come down to Ocon or Russell.
In my opinion, Bottas is doing better than Webber or post-accident Massa, who also kept their top team seats for many years.
Some F1 fans don't understand that "good enough" is often way better than "go for someone that might or might not turn out to be a more exciting option, but destabilise the team or risk that you end up with a driver who actually does a worse job than the previous one (if you go for a young, unproven one) ", especially when your 1st driver already does the job better than you could ask for. It's no coincidence that Bottas/Webber/Barrichello/late Raikkonen type of drivers are repeatedly being chosen by top teams over the years- because team principals know what they are doing and are aware that it's not that easy to find improvement over that and even if there is SOME chance for improvement, it's not worth the risk if the current pairing works well enough. If it ain't broke, don't fix it.
People often don't appreciate that drivers like Webber or Bottas basically outperformed all of their previous team-mates on their ways to the top seats. Just because there's a promising young driver somewhere among backmarker teams does not mean he will be an upgrade. It's a matter of perception because it's so much easier to hide your shortcomings everywhere outside the top teams. If top teams were quicker to give chances to various promising drivers, there would be much more flops and in the end those teams would be worse off in the long run.