OK, that's fair comment, though I have to say that ........"This is the second triumph I've owned and the second time I've felt the need to sell after 6 months starting to loose faith."
and "Really disappointing as this is the second triumph I have owned and the second one I've had a bad experience with. Wont be making this mistake again."
........ do rather read (to me) like a personal statement of, at very least, severe disappointment with the brand/name/model and
the perceived problems you face.
I currently own Triumphs from 1967; 1970; 1971; 1992; 1993; 1994; 1995; 1996; 1998 & 2010 and, whilst I wouldn't say that some spares are exactly easy to find it's usually possible to get something. It may require additional effort and probably requires additional cost but, in my experience, that's the 'cost of entry' to the game. I could be bitchy and suggest that 'if you want the best .....' but that's just a demonstration of a personal bias to which I'm happy to admit!
I honestly don't know if Triumph are any better or worse than other manufacturers in support and supply of parts for bikes older than 5 years - I suspect most manufacturers will have similar approaches to the EU legislation that governs vehicle manufacture and spare parts supply, though I may well be entirely wrong in that wholly subjective suspicion. I think the problem you face is that you're looking for something (TORs) that probably wasn't made in huge numbers; wasn't particularly popular when it was made, and is long since out of production, so you face a near perfect storm of adverse circumstances and, in my opinion, it just feels wrong to blame the ship for the weather you're sailing into. Apologies for the rather strangled mixed metaphor but, hopefully, you'll get my drift - pun intended!
I'm sure the Tuono's a lovely bike and, if you do sell and transfer your allegiances back to them, I do sincerely hope that you are happy and are able to get the parts you want and/or need. But, when you sign back up to the Tuono forum, I hope you don't blame the messenger for the message and denigrate Triumph for failings that I suspect are pretty much industry common, despite your previous good fortune.
Bear in mind :-"Triumph Motorcycles global sales in the first ten months 2020 have been 42,242 units, down 1.9%, one of the best score among premium brands ..... "
"Aprilia global sales performance in the 2020 is almost negative with year to date May sales down 37% ...."
A small but signiificant glimpse into the stats. and one that would worry me, personally, if I was looking to invest in any way into the Aprilia brand's product line. But, that is, of course, all down to personal choice, circumstance, preference and bias.
I wish you luck with whatever choice you do decide to make.