The government has legislated that the annual parish council meeting that is held in May, when the Chair is elected, is not required this year and that the status quo is maintained until May 2021 (the chair is still the chair, members of committees are still the same).
The option for holding virtual meetings is just that, optional and it is down to individual parish and town councils to decide if they want to go down this route or maintain a system of delegated powers, email approval etc. Some councils might suffer from appalling Wi-Fi or councillors not having laptops or smart phones - it does happen.
Both NALC and SLCC advised Clerks (before the virtual meeting legislation came in) that as long as decisions that are made have a complete audit trail / evidence that councillors were consulted, then there is very little likelihood of a legal challenge happening and if it did, that it would be upheld by the courts. There was also the advice given to hold back on major decision making where possible.
Now that the option for virtual meetings can happen, I would suggest that it is an ideal to hold council meetings online and to be as transparent as possible. I would also suggest that if there was a major decision to be made, then it should be during a virtual meeting. However, there is no legal requirement that states that councils MUST hold virtual meetings.
Hope the above helps