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It should not harm the flyback at all there is a diode there to block. I'd almost worry about SS diodes being damaged by transients, but HV diodes are usually multiple diodes with parallel capacitance and sometimes resistance to reduce and equalize strain on the diodes.
I've never seen damage from hard grounding the CRT (except for mistakes where technicians reflexes were triggered by discharge through the human body). Sets that are on and have repeated arcing for a few moments can implode...HV arcs get very hot in a concentrated area and glass does not like that...But It usually takes MUCH more than a simple discharge to get there.
The main advantage of the resistance method is that the charge will not bounce back and bite you 10 seconds later. (Had that happen enough to favor resistance strongly.)
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