And the team should check the balances once in a while, and maybe rethink the strategy, to avoid overworking someone and underworking someone else, thus creating bottlenecks and vacuums.
At least this is the way i have worked and organised such teams - 2-5 ppl covering everything. Frankly, we never had many customers :/ but even one is enough to generate plenty of "noise" - which sometimes is just noise, but if good customer, will be mostly real defects and generally under-tended parts. Also, good customers accept a NO as answer. So, do say more NOs.. there is some psychological phenomena in software engineering in saying yes and promising moonshots when one knows it cannot happen NOW, but looks good..
have fun!
[0] https://svilendobrev.com/rabota/orgpat/OrgPatterns-patlets.h...