HRV 945 is not available and it is in the 945 LTE. Can someone from Garmin answer?

You can use hrv on the 945.

1. In combination with a hr belt.

or

2. use one of the garmin connect apps and ohr

Acc to garmin it is about the ohr sensor. What's the use if you get a value but it's not exact. 

The FR 945 is 4 years old at this point regardless when you bought it, you were only guaranteed the features as advertised, anything else is a bonus. We’ve received a lot extra since release, which I am grateful for but don’t feel entitled to.

I think there is no point in being angry. Garmin just purposefully does not inform about dismissing their devices from an active support.
Devices and their capabilities are top tier, but the support and customer politics are worse than you can imagine. You only can "fix" your issue by buying another one, newer, "premium" device.

If you buy a new car and they release a newer model the next year, are you automatically entitled to the new features it offers regardless if they would be compatible with the older model?

Oh, man... The car does not rely on frequently updated software and is a little more "complicated" creation than a smartwatch. It's 2023, devices can be easily updated, revamped and kept up for years because all of them share basically the same hardware. If you can't keep up with software maybe you shouldn't release 5 different devices in the same branch each year and focus on the software. Oh, you would do that if there was any real and attractive alternative in the market and your customers wouldn't be already addicted to buying new devices over and over again.
I said there is no point of being angry... and I failed.

Your argument is emotive and still invalid. Our software is kept up to date with frequent releases to ensure support - that doesn’t necessarily include access to new features which may be reserved for newer models.

The HRV widget wasn’t a requirement for you when you bought the device, so why is it now when newer models have it.  We can agree to disagree though.

Why did the fenix 6 get the hrv!? It wasn't included when I bought it either.. The fr945 is the sport version of the fenix 6, so why do they differentiate between the two!? The fr945 is already 4 years old and there are still problems with it. Sync still doesn't work properly.. support is pretty lame.

I’m not disputing that it would be great to have HRV, but I accept that the 945 is now 4 generations old behind the 945 LTE, 955 and 965. The Fenix 6 is just one generation old at the moment. I look forward to the opportunity of upgrading to my next model when I can justify it 

I agree with the sentiment, but for me the lesson is that the top-end forerunner isn't a wise choice for long-term ownership. 

That makes me sad, I don't want to be generating waste by upgrading so I'll stick with what I have, but looked at from a cost/benefit point of view I'd be better buying a one-or-two steps down model and refreshing it more frequently to stay on top of features.

Part of my rationale for paying the premium price was the assumption that it would be premium support.  Between the flaky initial builds and how fast it's dropped back to maintenance-mode support I can see I was wrong.  Lesson learned.

My thoughts exactly!

To me Garmin is clearly and loudly stating that the Forerunner is a second tier product line.

My 945 is looking a bit rough around the edges and was looking forward to updating to the 965 but seeing how the 945 was dropped vs. Fenix 6 has got me thinking why would I want to pay the top tier price to be a beta tester for the first 6-12 months and after that get a second tier software support.

Having had both a Fenix and a FR and if I wouldn't greatly appreciate the form factor of the Forerunner over the Fenix I would see no point of getting the 965. If I would know that I'm getting the software support the hardware is capable Garmin would have my money every 2 to 4 years. 

Artificially restricting features by software and not due to hardware limitations is a business decision that might yield profits short term but long term it's going to cost them loyal customers like me.

I really hope Garmin merges the software side and makes the hardware the only choice the customer has to make.