Look, I agree totally that we do under-estimate the intelliegence of animals. I have had dogs all my life, and after their initial training, they are treated as my equal...particularly the two 55kg plus Rottweilers I had.😉 But I see it as drawing a very long bow to suggest octopuses will ever become space travellers...or colonising Mars, partly because of the reasons you nominated, that they seem to have hit an revolutionary wall with the whole mate and die thing....unless of course they are already present in some as yet to be discovered underground Ocean/water source on Mars...or Europa!
No probs, I have always reasoned that way, and see the often used comparison of Aliens and us, as analogous to us and ants, as dramatic overkill...sure they would be advanced, but that same advancement would enable them to recognise our own intellgence, (albeit limited as compared to theirs) but advanced enough to accomplish what we already have. That same level of intelligence on both sides would also see reasonable communication between them and us, (probably helped via mathematics and geometry) as not too great a problem.
My apologies this time...the joke went way over my head. I probably have expressed this to you before, but my greatest wish in life is for the extraordinary evidence needed to confirm ETL, be discovered before I kick the bucket. That and putting boots on Mars, and I can then die a happy little vegemite!😁
While that discovery of life elsewhere (in the first instant) will probably be the most simplest form/s of life, any confirmation of an advanced species, will obviously be much further afield. Our two great barriers prohibiting contact between two species of advanced life, is of course time and distance. But wouldn't it be great if in another few hundred years or so, some distant species intercepts one of the Voyagers, interprets the maths and geometry and replies back!!
I also, (as I expressed earlier and supplied a link) see the humanoid form, roughly speaking, as beneficial for advanced intelligence and space travel, and that space faring aliens certainly would not be octopuses!...or tomato plants.
In fact I see it as far more likely that we could be exchanging banter with an Alien species a few hundred light years distant, rather than actually them crossing the enormous distances and shaking hands with us.
ps: Good to see you back!