Perhaps therein lies the problem Autobrakes, crew these days don't actually get paid to do the job they are actually doing. At base wage that the current government has deemed below minimum wage, the company then expect a level of service higher than all the other premium airlines in the world.
You have crew who earn $34,000 base wage attempting to maintain standards to keep the business returning, but at the end of the day the incentive really isn't there.
If it was just about beef or chicken, coffee or tea, there wouldn't be a problem but it's not, and as for your CRM well it's quite telling isn't it. Perhaps you don't need a letter to say you're doing a good job, but on your wages I would think your satisfaction level is far greater.
A complimentary letter to some is justification that they are good at what they do and keeps them motivated to keep doing so. Even if it is for below minimum wage.
No harm in that.