Depends on how many customer complaints they get from overheating phones, poor battery life, poor performance, or whatever actual consumer-level problems result from their choices. It looks like Samsung will have more problems than Qualcomm (Exynos throttles too much). If customers do not care then maybe they can get away with it. Assuming consumers do not notice that A14, which is several months old, opened up a wider gap between it and Qualcomm's latest in both raw performance and performance per watt (compared to A13 vs. A77).
I am only one customer, but I am still on a Snapdragon 855+ phone (ROG Phone II) and Qualcomm's decision-making this generation is making me question when or if I will replace the phone with something newer.
Qualcomm doesn't get customer complaints, because they don't make phones. It is up to the phone OEMs to choose an appropriate clock rate to avoid overheating phones based on how well the phone's form factor can dissipate heat. There are always some that clock too high and get hot, and that would be true whether SD888 was 1/3 the performance of iPhone or 3x the performance, because they are looking to score a "win" in reviews like Anandtech's
against other Android phones using the same SoC. They've been behind Apple for years, another 5-10% doesn't matter. And hey, who knows, maybe Samsung's 3nm will turn out better than TSMC's so going with Samsung could be wrong today but right a couple years from now.
If there was a credible threat to Qualcomm's high end SoCs that made them worry that the 888 not being quite as fast as it could be if it was made on TSMC N5 would shift OEMs to choose someone else's SoC next time maybe it would be worth spending $100 million to tape out a separate design to offer a "higher end" version of the 888 made on TSMC. But no such threat exists - Mediatek's stuff probably doesn't even support all the US LTE/5G bands. Given the whining from some people when Apple used "inferior" Intel modems instead of Qualcomm, I can't imagine it would be any better if an Android OEM tried to sell people phones with Mediatek modems instead of Qualcomm.