Scientists use 110 mg/dl as the golden average for the blood glucose of healthy people. It is known that the blood glucose after fasting in the morning is usually the lowest of the day. It is typical for T2 diabetes that this average will change to 140 mg/dl and more (with smaller deviation) and this change will have long term consequences like complications. It is also known that numbers above 160 mg/dl will put pressure on the kidneys because they then start to filter blood glucose out of the blood stream. If you take the 130 mark you have room and time to act about it.
Healthy beta cells are used to produce insulin all the time. If they are being forced to produce higher amounts of insulin for longer periods of time they will burn out. This is what typically happens to T2 diabetics when the average is elevated to 140 mg/dl or higher. This is why they often need insulin because the production pressure has killed more than 70% of their beta cells. Your beta cells manage to keep good averages. The stress will be to cover the carb load from the meals. For this you are already using bolus insulin. Seen from this perspective I think your endo is right.
With additional basal insulin. Your beta cells would need to regulate their production down. If you have many residual beta cells the question is if their lowest production rate combined with your basal might be higher than what your basal needs are. If so you might have unwanted lows with addional basal on board.
Finally I would like to point out that meters are not accurate. They are often off by around 20%. The same blood glucose of 110 can give you numbers in the range of 88 to 132. So do not stress out about single elevated numbers. Take the average as your guideline and enjoy the ride.