This is worth a watch, just before you go into the shop
For a commercial shop, to not buy a saw with such a safety device I think would be a very poor decision. Why, well, the stats are clear that the circular saw is one of the most frequent causes of serious injury, so on your risk assessment it’s going to be one of those flagged for risk mitigation. The actual cost of the saw would not be seen as any reason not to buy one, it’s not outrageous expensive, and can probably be financed. So, assuming it’s not a start up company and has a good trading record, there is little to suggest say (I’m guessing) a £10K premium isn’t a barrier to having such a device. After all, if you are found guilty of a H&S breach for not reducing as far as reasonably practicable the risk, you face a few nights in the metal hotel worst case, or a serious raid on your finances best case.
For me, I would not want to think I’d contributed to a series injury for a lack of investment over something I knew was a major risk and I hadn’t done everything I could to mitigate it.
After all as an example Jimmy DiResta a fairly well known uTuber managed to cut off his little finger on a table saw whilst using push sticks!
I don’t run a commercial shop, mine is a hobby shop. If they put the technology on a saw that met my needs (a full slider doesn’t) would I buy it? Yes in a heart beat. I don’t like the saw stop system, I understand technically how it works, and it’s not something I’d positive decide to purchase.